Mouse & Rat case method: 50 questions

One January morning, you notice red stains around the eyes and nose of your 18-month-old female rat. The cage has wood-shaving bedding and is cleaned once a week. Looking closely, she is sneezing repeatedly, and you hear a faint crackling sound when she sleeps. She has lost 5 g since last week. It looks like blood, and you are alarmed.

What is the most appropriate response to this red discharge?

1. Treat it as bleeding, disinfect the red areas with an alcohol swab, and watch
2. Treat it as porphyrin, switch to paper bedding, adjust the room temperature, and see the vet the same or next day
3. Treat it as an eye disease, apply human eye drops 3 times a day, and observe for a week
4. Blame the dirty cage, just clean it, and do not see the vet

AnswerB. Treat it as porphyrin, switch to paper bedding, adjust the room temperature, and see the vet the same or next day

ExplanationThe red discharge is porphyrin, not blood; it is a sign of stress or respiratory disease. Sneezing, breathing sounds and weight loss together strongly suggest mycoplasma pneumonia. Dust from wood shavings and ammonia from once-a-week cleaning irritate the airways, so switch to paper bedding, keep the room at 22–26°C, and see the vet early. Left alone, it becomes chronic and causes irreversible lung damage. Alcohol irritates the skin and eyes, and human eye drops do nothing for the cause and only delay the visit. Cleaning alone does not cure the infection. If she starts breathing with her mouth open, see the vet the same day.

IssuesEnvironmental factors, wood shavings and once-a-week cleaning, were irritating the airways. Mistaking porphyrin for bleeding and failing to connect it with the key signs of breathing sounds and weight loss was also a problem.

ImprovementUse paper bedding and clean at least twice a week. Record weight weekly and treat a 5% or greater loss as a cue to see the vet. Remember that porphyrin is a sign of poor health, and film breathing sounds to show the vet.

While petting your 2-year-old female rat, you find a soft lump the size of a fingertip in her right armpit. When you touched it a week ago it was the size of a grain of rice, so it has clearly grown. She is lively, eating well, and shows no pain when the lump is touched. Online you read that "most rat tumors are benign."

What is the most appropriate response to this lump?

1. Since most are benign, do nothing and wait until the next checkup
2. Massage the lump firmly every day to see if it shrinks
3. Measure it with a ruler, photograph it, and see the vet within a week
4. Since it does not hurt, leave it alone until she can no longer move

AnswerC. Measure it with a ruler, photograph it, and see the vet within a week

ExplanationMammary tumors are very common in female rats, and even benign ones grow rapidly and interfere with walking and eating. Doubling in a week is a warning sign; the smaller the tumor, the less burdensome the surgery and the lower the risk of recurrence. Measuring and photographing it lets the vet judge the growth rate. The fact that most are benign is no reason to ignore it, and malignant tumors metastasize. Massaging hard damages tissue and causes bleeding and inflammation. Waiting until she cannot move raises the anesthetic risk and makes surgery itself difficult. If a lump grows quickly or hurts when touched, see the vet within a week.

IssuesThe owner delayed by not consulting the vet at the rice-grain stage and waiting to confirm growth. The online claim that "most are benign" was used as reassurance, and the danger sign of rapid growth was nearly missed.

ImprovementMake weekly whole-body palpation a habit, and record the size and a photo of any lump the day you find it. See the vet even for a rice-grain lump. Find a clinic that can operate on small animals in advance and ask about anesthesia and costs.

For a few days your 2.5-year-old female rat has been unable to hold food in her forepaws and tries to eat with her mouth only. This morning her head is tilted to the left, and she missed her footing and fell when climbing down from the hammock. The cage has 3 levels, with the water bottle on the top level. She responds to her name but walks awkwardly and seems listless.

What is the most appropriate way to set up the environment until the vet visit?

1. Remove the levels, flatten the floor, put food and water within reach, and see the vet the same or next day
2. Add a wheel to make her run, since lack of exercise is the cause
3. Straighten her neck by hand and fix it with a bandage
4. Clean her ears and put in human ear drops

AnswerA. Remove the levels, flatten the floor, put food and water within reach, and see the vet the same or next day

ExplanationThese are typical signs of a pituitary tumor, common in older female rats, with neurological symptoms such as head tilt, abnormal gait and inability to hold food in the forepaws. To prevent falls, remove the levels and hammock, flatten the floor, and move the top-level water bottle to a low position within reach. Since she cannot hold food, place soft food close by. See the vet the same or next day; medication can sometimes control the symptoms. A wheel leads to falls and fractures. Straightening or bandaging the neck is useless for neurological signs and causes fear and injury. Human ear drops have no effect because the cause is the brain, not the ears, and they delay the visit.

IssuesThe early sign of being unable to hold food a few days earlier was missed, and the condition progressed to head tilt and a fall. Keeping a tall 3-level setup for an elderly rat also raised the fall risk.

ImprovementFor rats over 2 years, observe movement daily and record changes in how she holds food and walks. Reduce the number of levels as she ages and put cloth on landing surfaces. Remember that head tilt or unsteadiness means seeing the vet the same or next day.

Your 18-month-old male rat is walking with a hind foot lifted. Turning him over, both foot pads are red and swollen, and one has a scab. The cage has a wire floor because it is easy to clean, and he weighs 100 g more than his cagemate. He gets sunflower seeds as a treat every day.

What is the most appropriate first step?

1. Pick off the scab, disinfect it, and keep the wire floor as is
2. Cover the wire floor with thick, soft bedding and see the vet within a few days to have the feet examined
3. Make rat socks, put them on, and let him walk while you watch
4. Apply plenty of human wound ointment to the feet and watch that he does not lick it

AnswerB. Cover the wire floor with thick, soft bedding and see the vet within a few days to have the feet examined

ExplanationPododermatitis is mainly caused by wire floors and obesity; constant pressure on the foot pads causes inflammation. The basis of treatment is to stop using the wire floor, lay a thick layer of paper bedding or similar, and keep it clean. Once scabs and swelling are present, bacterial infection can spread to the bone, so see the vet within a few days for antibiotics and other treatment. Picking off the scab deepens the wound and spreads infection. Socks trap moisture and make it worse, and may be chewed and swallowed. Human ointments contain ingredients that cause poisoning if licked, and nothing heals if the floor stays the same. Sunflower seeds are high in fat and promote obesity, so cut back.

IssuesA wire floor chosen for easy cleaning and obesity from too many sunflower seeds combined to put strain on the foot pads. The owner had not checked the foot pads until noticing the lifted-foot gait.

ImprovementAlways cover the floor with bedding, and put cloth or a board over any wire sections. Keep sunflower seeds and nuts to a tiny amount and weigh him weekly to maintain a healthy weight. Make a habit of checking foot-pad color during nail trimming and palpation.

Your 2-year-8-month-old male rat has recently been emptying his water bottle nearly twice as fast as before, and the urine stains in the bedding are spreading. His coat has become dull, he often sits hunched, and he has lost 60 g in 2 months. He has been given cheese or boiled egg as a daily treat. His appetite is only slightly reduced.

What is the most appropriate response to this condition?

1. Remove the water bottle and restrict his drinking, since drinking too much is the cause
2. Accept it as old age and prepare for end-of-life care
3. Increase protein such as cheese and egg to make up for the weight loss
4. Record the drinking, urination and weight loss, go back to a pellet-based diet, and see the vet within a few days

AnswerD. Record the drinking, urination and weight loss, go back to a pellet-based diet, and see the vet within a few days

ExplanationIncreased drinking and urination, weight loss and a dull coat are typical of kidney failure in older rats. Record the changes in drinking, urination and weight, see the vet within a few days, and have kidney function checked with blood tests. High-protein food burdens the kidneys, so cut back on cheese and egg and return to pellets as the staple. In kidney failure the body needs fluids, so restricting water causes dehydration and rapid deterioration. Skipping the vet because of age forfeits the chance to maintain quality of life with diet management and subcutaneous fluids. Adding protein is counterproductive. If he stops eating completely, switch to a same-day visit.

IssuesDaily high-protein treats of cheese and egg were burdening the kidneys. The owner noticed the changes in drinking and urination but did not connect them to a vet visit until 60 g had been lost.

ImprovementAfter 18 months of age, get checkups every 6 months and visually check the water bottle level every day. Limit high-protein treats to small amounts 2–3 times a week. Record weight weekly and treat a 10% loss as the cue to see the vet.

Ten days ago you put a female mouse bought at a pet shop into the same cage as your 2 existing mice. The newcomer keeps scratching her neck and shoulders, and on closer inspection there is a scab and a small bald patch on the back of her neck. Today one of the original mice has started scratching too. You recently switched to cheap bedding from an unknown brand.

What is the most appropriate response to this situation?

1. Assume the itching is dry skin and rub baby oil over the whole body
2. Isolate the newcomer in a separate cage, replace the cage contents and all bedding, and take all of them to the vet within a few days
3. Since the original mouse is scratching too, decide it is a self-limiting condition and watch
4. Put a small amount of dog flea treatment on the newcomer

AnswerB. Isolate the newcomer in a separate cage, replace the cage contents and all bedding, and take all of them to the vet within a few days

ExplanationIntense itching, scratch wounds on the neck and shoulders, scabs and hair loss are typical of skin parasites, often brought in by a new animal or questionable bedding. Since it has already started spreading to the original mice, isolate the newcomer, wash the whole cage, replace all the bedding, and take all of them to the vet within a few days for diagnosis and parasite treatment. Baby oil does nothing against parasites and fouls the coat. It does not resolve on its own; scratching leads to bacterial infection and abscesses. Dog parasite products are an overdose for a 25–50 g mouse with a high risk of fatal poisoning; always use medication prescribed by the vet.

IssuesThe new mouse was housed with the others on day one instead of being quarantined for 2 weeks, and switching to bedding of uncertain origin doubled the sources of infection. The scratching was overlooked for 10 days, allowing it to spread to the original mice.

ImprovementQuarantine new animals in a separate cage for at least 2 weeks and check skin and stool before introducing them. Use bedding from a trusted brand and check for foreign matter when opening it. If scratching increases, see the vet within 3 days.

At 1 a.m., your 2-year-old male rat has come out of his nest box and is sitting still. His belly heaves with each breath and he opens his mouth from time to time. His lips look more purple than usual. He has been sneezing for a week but seemed fine, so you did not take him to the vet. The room is 18°C; you have just turned off the heating.

What is the most appropriate action at this point?

1. Raise the room temperature, switch to paper bedding, treat the open-mouth breathing as an emergency, and call and go to the emergency (after-hours) animal hospital
2. Keep him in the dark until morning so as not to excite him, and see the vet first thing
3. Point a humidifier's steam directly at the cage to ease his breathing, then watch
4. Press on his chest by hand to assist breathing and keep doing so

AnswerA. Raise the room temperature, switch to paper bedding, treat the open-mouth breathing as an emergency, and call and go to the emergency (after-hours) animal hospital

ExplanationOpen-mouth breathing and purple lips are emergency signs of oxygen shortage and fall under "call the vet now" in the manual. A chronic respiratory infection has very likely flared up suddenly in the 18°C cold. Raise the room to 22–26°C, switch to low-dust paper bedding to reduce irritation, and call and go to the emergency (after-hours) animal hospital. Transport in a dark, quiet small box without jolting. Waiting until morning risks respiratory arrest. Steam aimed directly at the cage worsens breathing through sudden temperature change and excess humidity, and hot steam can cause burns. Pressing the chest of an animal that is breathing on its own is harmful and can damage the ribs and organs of such a small body.

IssuesThe sneezing a week earlier was dismissed and the vet was not consulted, so the chronic respiratory disease progressed. Turning off the heating at night and letting the room fall to 18°C triggered the sudden deterioration. The owner had not looked up an emergency hospital either.

ImprovementIf sneezing continues for 2–3 days, see the vet early. In winter, keep the room above 20°C at night with air conditioning or a heater, and put a thermometer beside the cage. Prepare the contact details of an emergency (after-hours) hospital that sees small animals and a transport box in advance.

Your 6-month-old female mouse was given a large amount of cabbage and apple for the first time yesterday. This morning her rear end is damp and dirty, and there is soft stool in the bedding. Fewer pellets have been eaten. She moves more slowly than usual but pokes her head out of the nest box when called. There is no blood.

What is the most appropriate response at this point?

1. Give even more vegetables and fruit to replace fluids
2. Dissolve a human antidiarrheal in the water bottle
3. Stop vegetables and fruit, give pellets and water only, and see the vet the next day if she does not eat for a day
4. Take away all food and water for 24 hours to rest the gut

AnswerC. Stop vegetables and fruit, give pellets and water only, and see the vet the next day if she does not eat for a day

ExplanationA sudden large amount of vegetables or fruit upsets the gut and causes soft stool. As the manual says, stop vegetables and fruit, give pellets and water only, and keep her clean by wiping her rear with a warm damp towel. See the vet the same day if there is blood in the stool, or the next day if she does not eat for a day. A mouse is so small that even a single day without food leads to rapid weakening, so keep observation short. More vegetables worsen the diarrhea and dehydration. Human antidiarrheals cannot be dosed for a 25–50 g mouse and risk poisoning. Removing food and water is life-threatening from dehydration and low blood sugar.

IssuesWhen introducing side food for the first time, the owner ignored the "start small" rule and gave a large amount at once. There was also little awareness that diarrhea can dehydrate a mouse dangerously within a short time.

ImprovementStart any new food with a fingernail-sized piece and increase only after checking the next day's stool. Keep side food to small amounts 2–3 times a week. Check stool daily, and record and photograph soft stool or a dirty rear. Remember that bloody stool means a same-day visit.

Your 1-year-old male mouse has been putting pellets in his mouth and dropping them for the past few days, and has lost 3 g. Looking closely at his mouth, the lower incisors are abnormally long and do not meet the upper teeth. There was a chew block in the cage, but it shows almost no sign of use. His chin fur is wet with drool.

What is the most appropriate response?

1. Trim the incisors short at home with nail clippers
2. Soften the pellets with water, and see the vet the same or next day to have the teeth treated
3. Give hard dried fish and wait for the teeth to wear down naturally
4. Do nothing, since the teeth will break off naturally if left alone

AnswerB. Soften the pellets with water, and see the vet the same or next day to have the teeth treated

ExplanationMouse and rat incisors grow throughout life, and if the bite is misaligned they do not wear down, overgrow, and prevent eating. Weight loss and drooling are proof that eating is already difficult, so see the vet the same or next day and have the teeth trimmed safely with proper instruments. Until then, soften the pellets to make them easier to eat and prevent further weight loss. Nail clippers split the tooth lengthwise and damage the root, causing pain and abscesses. Hard food does not wear down maloccluded teeth, and he will weaken while unable to chew. Left alone, the teeth can pierce the palate or cheek, and he may die from being unable to eat.

IssuesThe owner was reassured just by having a chew block in the cage and never checked whether it was used or how long the incisors were. Food was dropped for several days without looking for the cause until weight was lost.

ImprovementCheck incisor length and alignment during the monthly nail trim. Provide several kinds of chew items and watch whether they are used. Remember that dropping food and drooling are signs of dental trouble, and see the vet if they last more than 2 days.

Your 2-year-4-month-old female rat has had an abdominal lump for 6 months that has grown to 4 cm across; you hesitated over surgery and kept putting it off. This morning the skin over the lump has broken and turned dark red, and blood and fluid are seeping onto the bedding. She is bothered by it and keeps licking it.

What is the most appropriate response in this situation?

1. Pour plenty of over-the-counter antiseptic on the wound, apply an adhesive bandage, and watch
2. Press gently with clean gauze to control the bleeding, switch to paper bedding, and see the vet the same day
3. Let her keep licking it, since licking is healing behavior, and wait for it to heal naturally
4. Cut off the broken part yourself to make the lump smaller

AnswerB. Press gently with clean gauze to control the bleeding, switch to paper bedding, and see the vet the same day

ExplanationThe skin over a large tumor is stretched and breaks easily, and once broken it bleeds and gets infected. The manual lists "a lump has burst or is bleeding" as a same-day visit. Press gently with clean gauze to control the bleeding, switch to paper bedding that stays clean, and see the vet the same day for treatment and to discuss the plan going forward. Many over-the-counter antiseptics damage tissue, and an adhesive bandage will be chewed and swallowed and tears the skin when removed. Continued licking enlarges the wound and causes infection. Cutting it yourself causes massive bleeding and severe pain and can be fatal.

IssuesThe surgery decision was not made while the lump was small, and 6 months of delay let it progress to the point where the skin broke. The owner had not fully discussed concerns about surgery with the vet.

ImprovementSee the vet within a week of finding a lump and decide with the vet whether and when to operate. If unsure, ask specifically about anesthetic risk and costs to inform the decision. For an animal with a large lump, use soft bedding and low levels to protect the skin.

Your 2-year-old male rat is sitting hunched and still outside his nest box this morning, with his fur standing up and scruffy. Last night's pellets are almost untouched, and there are only a few small droppings. He feels colder than usual to the touch. His eyes are half closed and he responds slowly when called. His breathing is not fast.

What is the most appropriate first action?

1. Take him out for free-roam time and exercise to perk him up
2. Since he is cold, soak his body in hot water to warm him
3. Line a small box with cloth, stick a hand warmer on the outside of the box to keep him warm, and see the vet the same day
4. Since he is just not eating, push his favorite cheese into his mouth

AnswerC. Line a small box with cloth, stick a hand warmer on the outside of the box to keep him warm, and see the vet the same day

ExplanationHunched posture, raised fur, not eating, fewer droppings and slow responses are danger signs that he cannot maintain body temperature due to pain or weakness, and require a same-day visit whatever the cause. First prevent hypothermia: line a small box with cloth, stick a hand warmer on the outside to warm him gently, and transport him in the dark and quiet. Exercise uses up his strength and speeds the decline. Soaking in hot water causes shock from the sudden temperature change, and being wet actually drains body heat. Forcing food into his mouth leads to aspiration pneumonia. Remember that not eating for a day or no stool means a same-day visit.

IssuesThe loss of appetite and reduced droppings most likely began the previous evening, but there was no habit of checking how much food was eaten overnight. "Seems unwell" was taken vaguely, without measuring it against the same-day visit criteria.

ImprovementCheck leftover pellets and the number and size of droppings every morning, and see the vet the same day if anything differs. Keep a transport box, cloth and hand warmers ready, and know your regular vet's hours and closed days. Share how to keep a hypothermic animal warm with the family.

In the evening, your 1-year-10-month-old female mouse suddenly fell on her side in the cage, stiffened her limbs, and trembled all over. It stopped after about 30 seconds, and since then she has been dazed and motionless. She has lost weight over the past month and has occasionally been unsteady. Her cagemate is coming up to her.

What is the most appropriate response right after the seizure?

1. During a seizure, hold her down to stop the movement and put a finger in her mouth to protect her tongue
2. Separate her from the cagemate, move her to a dark, quiet small box, record the seizure details, and see the vet the same day
3. Give her water to revive her and walk her for 30 minutes to bring her round
4. A single seizure is no problem; see the vet if it happens again

AnswerB. Separate her from the cagemate, move her to a dark, quiet small box, record the seizure details, and see the vet the same day

ExplanationA seizure is an emergency under "call the vet now" in the manual, and in an elderly mouse it often has a tumor, kidney failure or low blood sugar behind it. After a seizure she is dazed and at risk of being attacked by the cagemate or falling from a level, so move her to a dark, quiet small box and let her rest. Record or film the time, number and appearance of the seizures, and see the vet the same day. Holding her down during a seizure causes fractures and bites, and a finger in the mouth gets bitten. Giving water while she is not fully conscious causes aspiration. There is no guarantee it will be a one-off; repeated seizures cause lasting brain damage and can be fatal, so "wait for the next one" is dangerous.

IssuesThe warning signs of weight loss and unsteadiness over the past month were not connected to a vet visit. There was also little awareness that a mouse's lifespan is only 1.5–2 years and that disease progresses rapidly after 18 months.

ImprovementFor mice over 18 months, weigh weekly and watch their gait daily, and see the vet the same or next day for unsteadiness. Decide in advance how to record seizures (time, duration, video). With several animals, keep a spare cage to separate a sick one temporarily.

An elementary-school child tried to catch a mouse during free-roam time and grabbed the tip of its tail; the mouse struggled, and about 2 cm of skin at the tip came off, exposing the bone. The mouse has fled into its nest box, and a little blood is seeping from the tail. The child is panicking and crying.

What is the most appropriate response?

1. Put the stripped skin back in place and wrap it with tape
2. Cut off the exposed part with scissors to stop the bleeding
3. Since the bleeding is slight, leave it and wait for it to dry up and fall off
4. Apply gentle pressure at the base of the tail to stop the bleeding, keep it clean, and see the vet the same day

AnswerD. Apply gentle pressure at the base of the tail to stop the bleeding, keep it clean, and see the vet the same day

ExplanationThe skin on a mouse's or rat's tail comes off easily; grabbing it strips the skin away, known as tail degloving. The exposed part will die, so it needs proper treatment at the clinic, such as removal of the dead tissue. For the bleeding, apply gentle pressure at the base of the tail, put the mouse in a small box with clean paper bedding, and see the vet the same day. The stripped skin cannot be reattached, and tape cuts off blood flow and spreads the tissue death. Cutting it yourself causes severe pain, bleeding and infection. Left alone, infection can travel up from the dead tissue and cost the whole tail or the mouse's life. The tail is an important organ for temperature control and balance.

IssuesThe child had not been taught the basic rule of never grabbing the tail, and the mouse was allowed to free-roam without a playpen despite how quick mice are. The family had not practiced how to catch it.

ImprovementPractice as a family catching the mouse by cupping its body in both hands or guiding it into a tunnel or cup. Free-roam mice inside a playpen and do not let children handle them alone. Decide in advance that any tail injury means a same-day vet visit.

At 11 p.m. you hear the wheel spinning, then a shrill squeal. Your 1-year-old male rat is dragging his right hind leg, and the foot hangs at an unnatural angle. The wheel is the rung type with gaps, and there are signs a foot got caught in it. The rat is motionless in a corner of the nest box and tries to bite when you touch the leg.

What is the most appropriate response?

1. Pull the leg straight to reset it and splint it with a chopstick
2. Without handling him, move him to a small box lined with cloth, remove the wheel and levels, and see the vet the same day
3. Leave him quietly in the cage overnight until the pain subsides and decide in the morning
4. Crush a grain-sized piece of human painkiller into water and give it to him

AnswerB. Without handling him, move him to a small box lined with cloth, remove the wheel and levels, and see the vet the same day

ExplanationA foot that hangs and cannot bear weight strongly suggests a fracture, and the manual lists "a dangling limb" under call the vet now. Touching or pulling the fracture lets bone fragments damage nerves and blood vessels, and a home splint will be chewed off and makes things worse through poor fixation. Without handling him, move him to a small box lined with cloth, remove the wheel and levels so he cannot move about, and see the vet the same day (the emergency hospital at night). Left overnight, the bone shifts and fails to heal, and he weakens from pain. Human painkillers contain ingredients that cause fatal stomach ulcers and kidney damage in rats; never give them on your own judgment.

IssuesA rung-type wheel with gaps is a classic cause of trapped feet and accidents. The owner did not know how urgent a fracture is and may not have known where to go at night.

ImprovementUse a solid-surface wheel with no gaps, at least 30 cm in diameter for rats and 15 cm for mice. Check wire floors and mesh shelves for places feet can get caught. Remember that "a dangling limb" means call the vet now, and keep the emergency (after-hours) hospital's number handy.

You keep 2 male mice, now 4 months old, in the same cage. This morning there are blood stains in the bedding, and one has several bite wounds on his back and the base of his tail. The wounds are shallow but fur has been pulled out, and the other mouse is chasing him. The bitten one is trembling in a corner.

What is the most appropriate response?

1. Wash the wounds under running water, separate them into different cages immediately, and see the vet if swelling or pus develops
2. They are brothers and will make up, so keep them in the same cage and watch
3. A bigger cage will end the fighting, so move both to a large cage
4. Apply human antibiotic ointment to the wounds and keep them together

AnswerA. Wash the wounds under running water, separate them into different cages immediately, and see the vet if swelling or pus develops

ExplanationMale mice become strongly territorial at sexual maturity and fight fiercely even with brothers. The manual says male mice should not be housed together; once fighting starts it does not stop and can end in death. Wash the wounds, keep them clean, and separate the mice into different cages at once. Mouse bites readily form abscesses with pus under the skin, so see the vet if there is swelling, pus or loss of appetite. Keeping them together in hope of reconciliation means deeper wounds the next day. A bigger cage just gives them more territory to fight over. Human antibiotic ointment is dangerous because it gets licked off, and new wounds will keep appearing as long as they live together.

IssuesThe owner housed 2 males together without knowing that male mice fight after maturity. There was no sex check or expectation of when maturity would come, and no spare cage was ready.

ImprovementKeep male mice singly as a rule and check sex when acquiring them. With several animals, always keep a spare cage, and separate them before blood is drawn when early signs like chasing or fur loss appear. Check bite wounds for swelling every day.

During free-roam time your rat went behind the TV, and shot out after a loud crack. The fur around his mouth is singed, his lips have turned white, and he is drooling. Part of the cord's insulation is stripped, exposing copper wire. He is breathing, but keeps opening and closing his mouth restlessly.

What is the most appropriate response?

1. Open his mouth with your fingers to check inside and have him hold ice in his mouth to cool it
2. First unplug the power and move him away from the cord, see the vet the same day, and go immediately if breathing problems appear
3. Mouth burns heal on their own, so give only soft food and observe for a week
4. Apply human burn ointment to his lips to ease the pain and watch

AnswerB. First unplug the power and move him away from the cord, see the vet the same day, and go immediately if breathing problems appear

ExplanationA mouth burn from electric shock damages the inside of the mouth more deeply than it looks, and pulmonary edema can cause breathing difficulty hours later. To prevent a second accident, turn off the power before moving the rat away from the cord. As the manual says, a mouth burn means a same-day visit, and signs such as fast breathing or open-mouth breathing mean go immediately. Prying the mouth open gets you bitten and makes him thrash in pain, and ice damages tissue. A week of observation misses tissue death in the mouth and pulmonary edema. Human burn ointment gets licked and swallowed, and hides the state of the wound from the vet.

IssuesThe cords behind the TV were not cleared away before free-roam time and no cord covers were used. The owner underestimated the rat's instinct to chew cords and did not stop him before he went somewhere out of sight.

ImprovementFence off the free-roam area, and cover all cords or lift them off the floor. Block gaps so he cannot get behind furniture. After an electric shock, watch for breathing problems hours later and keep observing his breathing through the night.

While trimming the nails of your 2.5-year-old senior rat, he struggled and you cut a front nail too deep, into the blood vessel. Blood is dripping from the nail tip, and he is shaking his paw, smearing blood on the floor and walls. When you try to press with a tissue, he resists and runs away.

What is the most appropriate response?

1. Soak the paw in water to wash the blood away
2. Wrap him in a cloth to calm him, press the nail tip with clean gauze for 5 minutes, and if it does not stop, keep pressing and go to the vet
3. Cauterize the nail tip with a lighter flame to stop the bleeding
4. Since the bleeding is slight, let him go back in the cage and wait for it to stop on its own

AnswerB. Wrap him in a cloth to calm him, press the nail tip with clean gauze for 5 minutes, and if it does not stop, keep pressing and go to the vet

ExplanationBleeding from a cut nail vessel usually stops with firm pressure using clean gauze for 5 minutes. If he struggles, wrapping him in a cloth to block his view calms him and makes pressing easier. As the manual says, if it has not stopped after 5 minutes of pressure, keep pressing and go to the vet. Soaking in water prevents clotting and prolongs the bleeding. Burning causes a burn and severe pain, makes him thrash, and invites infection. If released, he moves about and keeps bleeding; in a rat of such low body weight even small blood loss matters, and the wound gets contaminated by bedding. In future, it is safer to have the vet trim the nails of an animal that struggles.

IssuesSenior rats' nails grow fast and they struggle easily, yet the owner tried to trim at home without restraint preparation or styptic supplies. Not checking where the blood vessel was and cutting a lot at once also caused it.

ImprovementTrim nails monthly, only 1 mm off the tip, in a bright place where you can see the blood vessel. Keep styptic powder and gauze with the nail-trimming kit. Have the vet trim nails on animals that struggle or are elderly, and use two people for restraint.

This morning your rat was stuck hanging with a hind leg caught in the hammock. A frayed thread was wound around the ankle, and when you freed it the foot was swollen and reddish-purple. He keeps licking the foot and will not put it on the floor. You do not know how long he was tangled.

What is the most appropriate response?

1. The swelling is from being tangled, so warm it to improve circulation and watch until next week
2. Tape the foot to stop him licking it until the swelling goes down
3. Since the time tangled is unknown and there is a risk of tissue death, see the vet the same day
4. Soak the swollen foot in antiseptic and put him back in the same hammock

AnswerC. Since the time tangled is unknown and there is a risk of tissue death, see the vet the same day

ExplanationWhen a thread cuts off blood flow, the longer it lasts the more the tissue of the foot dies, and amputation may be needed. Reddish-purple swelling is a sign of impaired circulation; if the time tangled is unknown, see the vet the same day to check whether blood flow recovers and whether there is a fracture or ligament injury. Warming and waiting means you will not notice tissue death progressing. Taping further blocks blood flow. Soaking in antiseptic does nothing for the circulation, and the same hammock will tangle him again. Until the visit, reduce the levels, remove the hammock, and keep him resting low down. Continuous licking is itself a sign of severe pain.

IssuesThe hammock's frayed threads were not being inspected. The manual says to check for frayed threads, but the owner was not aware that worn fabric items lead to entanglement accidents.

ImprovementCheck hammocks and fabric items daily for fraying and holes and replace them as soon as they wear. Avoid loosely woven fabric and materials that shed threads. Make checking for a stuck animal the first thing you do each morning, and treat any limb swelling as a same-day visit.

Your rat gnawed on the cage wire all night, and this morning one upper incisor is broken off near the base and there is a little blood from his mouth. The remaining tooth looks loose. He tries to eat but grimaces in pain and lets go of the food. There is no chew block in the cage.

What is the most appropriate response?

1. Pull out the loose tooth with your fingers to remove the source of pain
2. Teeth regrow, so do nothing and give the usual hard pellets
3. Rinse the mouth with antiseptic and scold him so he stops gnawing the wire
4. Give softened pellets and see the vet the same or next day to have the bite alignment checked

AnswerD. Give softened pellets and see the vet the same or next day to have the bite alignment checked

ExplanationWhen an incisor breaks, the remaining tooth overgrows and the bite goes out of alignment, causing malocclusion. If the root of the broken tooth is damaged, it may grow back crooked. See the vet the same or next day to have the remaining tooth adjusted and the root checked, and until then give softened pellets so he can eat without pain and does not lose weight. Pulling the loose tooth destroys the root so it never regrows and causes heavy bleeding. Hard pellets are too painful to eat and he will weaken. Antiseptic irritates the mouth, and scolding does not remove the reason for gnawing (boredom and no chew block).

IssuesWith no chew block, the rat relieved boredom and tooth growth by gnawing the wire. The owner did not know that wire gnawing damages the teeth and mouth and made no effort to stop it continuing all night.

ImprovementKeep chew blocks and wooden toys in the cage at all times and reduce boredom with enrichment such as treats hidden in crumpled paper. Meet his exercise needs with 30+ minutes of daily free-roam time. Check tooth length and color monthly, and line the inside of the wire with wooden boards so he cannot gnaw it directly.

A neck wound from a cagemate's bite 2 weeks ago had swollen up, and this morning it burst; yellow creamy pus has run out and matted the fur. The rat is lively and eating, but the area around the wound is red and hot. There is a strong smell.

What is the most appropriate response?

1. Wipe the wound clean with a warm damp towel and see the vet the same day for flushing and antibiotic treatment
2. Assume it is healed now that the pus is out, cover the wound with an adhesive bandage, and leave it
3. Keep squeezing the wound hard to force out every bit of pus
4. Crush human antibiotic tablets into his food and give them for a week

AnswerA. Wipe the wound clean with a warm damp towel and see the vet the same day for flushing and antibiotic treatment

ExplanationRat bite wounds readily form abscesses with pus under the skin, and even after bursting, pus and bacteria remain inside and it recurs. Even if he seems lively, the redness and heat around the wound show the infection is ongoing, so see the vet the same day to have the inside flushed and get antibiotics prescribed by the vet. Until then, wipe the surface with a warm damp towel and use clean paper bedding. An adhesive bandage traps the pus and makes it worse. Squeezing hard damages healthy tissue and pushes bacteria deeper. Human antibiotics cannot be dosed correctly, and some kinds disrupt the gut flora and cause fatal diarrhea.

IssuesThe bite 2 weeks ago was not seen by a vet, and the owner kept watching even when it swelled. Either the cagemates were not separated, leaving the risk of recurrence, or the owner did not know that bites readily form abscesses.

ImprovementWhen you find a bite wound, wash it and separate the cages, and see the vet as soon as swelling appears. With several animals, watch compatibility when introducing new ones and after maturity, and break up any pairing where chasing or biting continues. Photograph the wound's progress daily.

For winter warmth you put fluffy cotton nesting material in the cage. Three days later, cotton fibers are wound around a toe on your mouse's hind foot, and the tip of the toe has turned blackish and dry. The mouse is running around without paying attention to the foot, but the toe does not bend.

What is the most appropriate response?

1. The black part is dirt, so scrub it in warm water and put the cotton back
2. Carefully remove the cotton, see the vet within a few days since the discolored part may be dead tissue, and stop using cotton nesting material
3. Since he is running around happily, decide it is fine and leave it until the next nail trim
4. Cut off the black part of the toe yourself with scissors and disinfect it

AnswerB. Carefully remove the cotton, see the vet within a few days since the discolored part may be dead tissue, and stop using cotton nesting material

ExplanationThe fibers of cotton nesting material are fine and strong; they wind around toes and ankles, cut off blood flow, and the toe tip dies before you notice. The manual says never to use cotton nesting material. Carefully remove the wound cotton, and since the black, dry part is very likely dead tissue, see the vet within a few days for treatment of the dead tissue and prevention of infection. Stop cotton immediately and switch to paper nesting material. Scrubbing dead tissue does not revive it, and putting the cotton back will tangle him again. Even if he seems lively, infection spreading from the dead tissue can be fatal. Cutting it yourself causes bleeding, severe pain and infection.

IssuesCotton nesting material, dangerous for mice, was used for winter warmth. The owner prioritized its fluffy, warm-looking appearance and had no habit of checking the toes daily.

ImprovementUse paper nesting material only, and never put cotton, frayed cloth or yarn in the cage. Provide winter warmth with a heater and extra paper nesting material. Make a daily habit of checking the color of the toes and tail and looking for anything wound around them.

Thinking "they are both small animals, let them play," you put your mouse into the hamster's cage. The hamster attacked instantly and bit deep into the mouse's abdomen. After pulling them apart, there is a hole about 1 cm across in the belly with some internal tissue visible. There is not much bleeding, but the mouse is limp.

What is the most appropriate response?

1. Stitch the wound closed with thread, apply antiseptic, and put the mouse back in its cage
2. Cover the wound with clean gauze, keep the mouse warm in a small box lined with cloth, and go to the vet immediately
3. Since there is little bleeding, apply an antiseptic ointment and watch until tomorrow
4. Give water to revive him and stroke him for a while to calm him

AnswerB. Cover the wound with clean gauze, keep the mouse warm in a small box lined with cloth, and go to the vet immediately

ExplanationA deep abdominal bite may have reached the organs or peritoneum, and even with little visible bleeding the mouse can die suddenly from internal bleeding or shock. Being limp is a sign of shock, and he needs the vet immediately. Cover the wound lightly with clean gauze, keep him warm in a small box lined with cloth with a hand warmer on the outside, and transport him in the dark and quiet. Stitching at home worsens his condition through infection and severe pain. A human ointment hides the state of the wound, and waiting until tomorrow means death from peritonitis or shock. Giving water to a limp animal causes aspiration, and stroking only delays treatment.

IssuesThe owner put them in the same cage without understanding that hamsters are solitary, strongly territorial, and attack other rodents. The misconception that they are "both small animals" caused a serious accident.

ImprovementNever let animals of different species share a cage or come into contact in the same space. Keep mice and rats apart not only from cats, ferrets and snakes but also from other rodents. Remember that a deep wound or a limp animal means go to the vet now, and keep transport supplies ready.

Your 1-year-old rat was riding on your shoulder when you stood up, and he fell 1 m from the desk to the floor. He lay still right after the fall, then got up after about 10 seconds, but there is a little blood from his nose and he drags his right foreleg when he walks. The floor is hardwood and the fall made a loud thud. He is now sitting still in a corner.

What is the most appropriate response?

1. Since he got up and walked, decide he is fine, return him to the cage, and carry on as normal
2. Pick him up and press firmly all over his body to check for fractures
3. Move him to a small box to rest and keep warm, and see the vet the same day because of the nosebleed and the leg problem
4. Stuff tissue into his nostrils to stop the nosebleed

AnswerC. Move him to a small box to rest and keep warm, and see the vet the same day because of the nosebleed and the leg problem

ExplanationThe manual says that if an animal is not moving, drags a leg or has a nosebleed after a fall, see the vet the same day. A nosebleed is a sign of head trauma or internal injury, and dragging a leg suggests a fracture or dislocation. Right after a fall, adrenaline lets him walk, but hours later he can deteriorate suddenly from internal bleeding or brain swelling. Line a small box with cloth, keep him resting and warm, and see the vet the same day. Returning to normal just because he walked means missing deterioration. Pressing hard all over worsens a fracture and gets you bitten from the pain. Stuffing the nose obstructs breathing; rats breathe mainly through the nose and could suffocate.

IssuesStanding up with the rat on a shoulder is a handling habit with a high risk of falls from height. Rats have poor eyesight and cannot judge heights well, and awareness of fall prevention was lacking.

ImprovementOnly let a rat ride on your body while seated on the floor or a bed, and return him to the cage or your hands before standing. Learn the post-fall checklist (movement, gait, nosebleed, breathing) and see the vet the same day if even one applies.

While searching for a mouse that vanished during free-roam time, you hear a squeak from the back of a closed desk drawer. Opening it, you find her body wedged between the back of the drawer and the desk; when you pull the drawer out, she crawls free on her own. She is breathing fast, her belly looks sunken, and her hind legs move weakly.

What is the most appropriate response?

1. Since she got out on her own, decide she is unharmed, return her to the cage, and feed her
2. Gently massage her belly to put the organs back in place
3. Move her to a dark, quiet small box, watch her breathing, and go to the vet immediately because of the breathing problem and hind-leg weakness
4. Make her walk repeatedly to move her hind legs and check for paralysis

AnswerC. Move her to a dark, quiet small box, watch her breathing, and go to the vet immediately because of the breathing problem and hind-leg weakness

ExplanationWhen the body is crushed, rib fractures, lung damage, organ rupture and spinal injury can occur even without external wounds. Fast breathing and weak hind legs are emergency signs of chest or spinal injury, and she needs the vet immediately. Move her to a dark, quiet small box, watch her breathing while transporting, and do not jolt her. Even if she crawled free, internal bleeding progresses with time, and she is in no state to eat. Massage further damages injured organs and broken ribs. Making her walk worsens a spinal injury and makes the paralysis permanent. Remember that crush injuries often deteriorate suddenly hours later.

IssuesThe mouse was left unwatched during free-roam time and her whereabouts were not checked before closing the drawer. Mice are quick and squeeze into gaps, so free-roaming without a playpen was itself a risk.

ImprovementFree-roam mice inside a playpen or enclosure where they cannot get into furniture gaps or drawers. Make a habit of always checking where she is before closing a drawer or door. Decide in advance that a crush injury means going to the vet immediately, even with no external wound.

At night, as you went to sit on the bed while your rat was out free-roaming, you sat on him as he burrowed under the covers. You jumped up at his squeal; he is lying on his side, breathing fast with his mouth open. He tries to move but cannot get up.

What is the most appropriate response?

1. Open-mouth breathing is an emergency, so move him to a small box without jolting and take him to the emergency (after-hours) animal hospital
2. Stroke him and talk to him until he calms down, and consider the vet if he still cannot move after 30 minutes
3. Since he is breathing with his mouth open, blow air into his mouth to give artificial respiration
4. Rub his back to stand him up and check whether he can walk before deciding

AnswerA. Open-mouth breathing is an emergency, so move him to a small box without jolting and take him to the emergency (after-hours) animal hospital

ExplanationFast, open-mouth breathing after a crush accident most likely means breathing difficulty from lung damage, pneumothorax or internal bleeding, and "open-mouth breathing" in the manual means call the vet now. Move him to a small box lined with cloth without jolting, keep it dark and quiet, and take him to the emergency (after-hours) hospital. During a 30-minute wait he could die from respiratory failure or blood loss. Artificial respiration is unnecessary for an animal breathing on its own and damages the lungs in such a small body. Forcing him to stand worsens a spinal or pelvic fracture. Watch his breathing during transport and switch to rescue breathing, covering the nose and mouth with a cloth and blowing gently, only if breathing stops.

IssuesThe owner sat down without checking under the covers during free-roam time. As the manual says to check under cushions and bedding before sitting, there was insufficient regard for a rat's habit of burrowing into fabric and gaps.

ImprovementShuffle when walking during free-roam time, and always check under cushions and bedding before sitting or lying down. Remove bedding and cushions from the free-roam area or fence it off. Keep the emergency (after-hours) hospital's number handy and a transport box ready.

In the evening, you forgot to close the cage door and your female mouse escaped. You searched the room but could not find her, and the family says "she'll turn up" and is about to go out for dinner leaving a window open. There is a cat in the house, and the door to the next room is also open. The mouse is timid and runs away when people approach.

What is the most appropriate first action?

1. Move all the furniture, call her name loudly, and grab her quickly the moment you see her
2. Set a glue trap in a corner of the room to catch her
3. She will come back on her own, so go out with the window open and search in the morning
4. Close the windows and doors, shut the cat in another room, set out an open cage with favorite food, darken it, and collect her at night

AnswerD. Close the windows and doors, shut the cat in another room, set out an open cage with favorite food, darken it, and collect her at night

ExplanationAs the manual says, when a mouse escapes, first close off the room, set out an open cage with favorite food, darken it, and wait for the nocturnal mouse to return on her own; this is the safest and surest method. The top priority is closing the windows to prevent escape outdoors and shutting the cat in another room to prevent predation, and also closing the door to the next room to narrow the search area. Loud voices and moving furniture drive a timid mouse deeper into hiding, and grabbing quickly causes tail degloving or falls. A glue trap strips skin and fur, and removing her from it causes fractures or suffocation, a serious accident. Going out with the window open allows escape outdoors, predation by crows and others, and being killed by the cat.

IssuesA basic check was missed by forgetting to close the cage door, and there was little awareness of keeping a mouse separated in a house with a cat. The whole family did not share the dangers of escape or how to recover her.

ImprovementFit a latch on the door and push it with a finger after each care session to confirm it is shut. Never keep her in the same room as cats or ferrets, and keep the room door closed at all times. Share the escape procedure (close windows, isolate predators, open cage) with the family, and keep no glue traps in the house.

Your rat, free-roaming in the bathroom, fell into the sink, which was still full of water. By the time you noticed he was limp underwater; when you lifted him out he was not breathing, soaked and cold. His eyes are open and water is coming from his mouth. He does not respond when moved.

What is the most appropriate first action?

1. Point his head downward to drain the water, and if he is not breathing, cover his nose and mouth with a cloth and breathe gently into them while preparing to transport
2. Blow hot air from a hair dryer over his whole body to warm him and wait for him to wake up
3. Press hard on his chest with both hands to make him spit out the water, and give up if he does not move
4. Wrap him in a towel, lay him down quietly, and wait an hour for breathing to return on its own

AnswerA. Point his head downward to drain the water, and if he is not breathing, cover his nose and mouth with a cloth and breathe gently into them while preparing to transport

ExplanationIn drowning, the first priority is clearing water from the airway: hold the head downward for a few seconds and let water drain from the mouth and nose. If he is not breathing, follow the manual's CPR: cover the nose and mouth with a cloth and breathe gently. If there is no heartbeat, compress the chest with a thumb at 200+ per minute, and keep going while transporting even if there is no response after 1 minute. Dry him with a soft towel and warm him gently with a hand warmer on the outside of a small box. Hot air from a dryer causes a sudden temperature change in a hypothermic body and can cause burns. Pressing hard with both hands damages the ribs and organs. Waiting an hour doing nothing loses the chance to save him.

IssuesFree-roam time was set up in a place with a sink full of water. The owner did not appreciate that rats have poor eyesight and cannot tell a water surface from a floor.

ImprovementKeep free-roam time away from water areas (bathroom, bath, toilet), and cover or put away any container or basin holding water. Print the resuscitation steps for respiratory arrest (drain water, rescue breathing, chest compressions, transport) and post them beside the cage.

During the morning routine, you heard your rat squeal the moment you closed the cage door. The middle of his tail was caught in the door; when you quickly opened it, part of the tail was flattened and dark red. There is only a trace of blood, and the rat dragged his tail back into the nest box. The tip of the tail seems to be moving.

What is the most appropriate response?

1. It is a minor bruise, so give him his usual free-roam time and watch how he moves
2. Wrap the crushed part tightly in a bandage to protect it
3. Keep him resting in a small box, watch for color changes in the crushed part, and see the vet the same or next day
4. Since the tail tip moves, decide there is no problem and do nothing for a week

AnswerC. Keep him resting in a small box, watch for color changes in the crushed part, and see the vet the same or next day

ExplanationThe tail is a chain of small bones, the caudal vertebrae, and catching it in a door causes fractures and impaired blood flow. A flattened, dark red area is a sign of internal bleeding and poor circulation, and over time the tissue can die and the tip fall off. Keep him resting in a small box, watch for color changes (darkening, drying), and see the vet the same or next day to check for fractures and blood flow. Free-roam time adds strain to the injured area. A tight bandage further cuts off blood flow and hastens tissue death. A moving tip does not rule out fracture or poor circulation, and a week of neglect lets infection spread from the dead tissue.

IssuesThe owner did not check where the rat was when closing the door. As the manual says to check with a finger when closing the door, there was insufficient regard for a rat's habit of coming to the door.

ImprovementAlways look where the rat's body and tail are before closing the door, and feel with a finger as you close it to make sure nothing is caught. During care, guide him toward the nest box or put a treat on the side away from the door. Record tail color changes daily after any injury.

One spring afternoon, you put your rat on the balcony table for some sun and looked away for a few dozen seconds; a crow swooped down, pecked the rat, and flew off. The rat has fallen under the table with several puncture-like wounds on his back, trembling and breathing hard.

What is the most appropriate response?

1. The wounds are small, so disinfect them, bring him inside, and decide about the vet based on how he is tomorrow
2. Call his name loudly and hug him tightly to calm him down
3. Crow germs are nothing to worry about, so rinse the wounds with water and return him to the cage
4. Cover the wounds with clean gauze, keep him warm in a dark small box, and go to the vet immediately

AnswerD. Cover the wounds with clean gauze, keep him warm in a dark small box, and go to the vet immediately

ExplanationPuncture wounds from a bird's beak are deep even when they look small, and may have caused organ damage or pneumothorax. Hard breathing and trembling are signs of shock, and he needs the vet immediately. Cover the wounds lightly with clean gauze, keep him warm in a dark small box with a hand warmer on the outside, and transport him quietly. Puncture wounds easily become infected and need flushing and antibiotics from the vet. Waiting until tomorrow risks sudden deterioration from internal bleeding or infection. Loud voices and tight hugging cause fatal stress to an animal just attacked by a predator. Rinsing alone does nothing for deep injuries or infection.

IssuesDespite the manual clearly saying never to take them onto a balcony or outdoors because crows will attack, the owner took him outside for the mistaken purpose of sunbathing. A nocturnal rat does not need sunbathing.

ImprovementNever take rats or mice outdoors or onto a balcony. Keep the cage in a quiet indoor spot out of direct sunlight and out of reach of predators (cats, crows). Learn the signs of shock (hard breathing, trembling, limpness), and go to the vet immediately after any predator attack, however small the wounds.

Late at night you hear squeaking and the wheel rattling in the cage. A toe on your mouse's front foot is caught in a gap of the metal mesh wheel, and she is hanging upside down and thrashing. The toe looks deformed and is pulled each time the wheel turns.

What is the most appropriate first action?

1. Stop the wheel by hand and hold it still, support her body with a cloth, and slowly free the trapped toe without forcing it
2. Spin the wheel hard in the opposite direction to free the toe
3. Grab her body and pull to yank the toe out in one go
4. Wait for her to free herself and check in the morning

AnswerA. Stop the wheel by hand and hold it still, support her body with a cloth, and slowly free the trapped toe without forcing it

ExplanationFirst stop the wheel by hand and hold it still so there is no more pulling. Gently support her body with a cloth to take her weight off the toe, and slowly free it in line with the direction of the gap. Afterward, if the toe is deformed or swollen a fracture is suspected, so see the vet the same day. Remove the wheel and levels and keep her resting in a small box. Spinning in reverse twists the toe further, risking severing it or worsening the fracture. Yanking her body strips the skin off the toe and tears it off. Waiting until morning leaves her hanging with the blood flow to the toe cut off, and she could die from tissue death and extreme stress.

IssuesUsing a metal mesh wheel with gaps was the direct cause of the accident. The owner did not know the manual's rule that wheels must have a solid surface and had no awareness of safe design.

ImprovementUse a solid-surface wheel with no gaps, at least 15 cm in diameter for mice and 30 cm for rats. Check mesh shelves and ladders in the cage for places toes can get caught. Always check unusual squeaks or sounds right away, and keep the cage where you can hear it at night.

During free-roam time your 30 g mouse found a piece of chocolate bar (about 2 cm square) on the floor and was eating it eagerly. By the time you noticed, about half was gone. So far she is running around normally, but you have heard chocolate is dangerous for dogs. It is 9 p.m. and your regular vet is closed.

What is the most appropriate response?

1. It is only dangerous for dogs, so let her finish the rest
2. Give her salt water to force her to vomit
3. Take away the rest, call the emergency (after-hours) animal hospital since the amount is large for her body weight, watch for trembling or agitation, and follow their instructions
4. Give her milk to dilute the poison and watch until morning

AnswerC. Take away the rest, call the emergency (after-hours) animal hospital since the amount is large for her body weight, watch for trembling or agitation, and follow their instructions

ExplanationThe theobromine in chocolate is toxic to mice too; for a 30 g body even a 1 cm piece is a large dose relative to body weight and can cause agitation, trembling, seizures and heart rhythm problems. First take away the rest, then call the emergency (after-hours) hospital, report the amount eaten and her weight, and follow their instructions. Symptoms can appear hours later, so watch for trembling, restlessness and fast breathing, and transport her immediately if they appear. Rodents cannot vomit, so inducing vomiting is pointless and salt water causes salt poisoning. Milk does not dilute the poison and causes diarrhea. Letting her eat the rest worsens the poisoning.

IssuesFood on the floor was not cleared away before free-roam time. The owner lacked the body-weight perspective that an amount tiny for a human can be a lethal dose for a small mouse.

ImprovementAlways clear food, medicines and small items from the floor before free-roam time and use a playpen. Share the list of forbidden foods (chocolate, onions/leeks, avocado, raw beans, etc.) with the whole family. Find an animal hospital with after-hours service and be ready to report weight and amount eaten right away.

Your rat carried a rubber band from the desk back to his nest box, and the next morning it was about half its original length. There are a few chewed fragments in the bedding, but clearly not enough to account for it. He is lively, but this morning he has eaten less and his droppings are smaller than yesterday.

What is the most appropriate response?

1. Rubber is digested, so there is no problem; carry on as usual
2. Give olive oil with a dropper to stimulate the gut
3. Stop food and give water only until he passes stool
4. Record his stool and appetite, and since both are reduced, see the vet the same or next day

AnswerD. Record his stool and appetite, and since both are reduced, see the vet the same or next day

ExplanationAs the manual says, rats chew and swallow cotton, rubber bands and plastic, which can cause intestinal blockage. Reduced food intake and smaller droppings suggest the gut may already be blocking, so see the vet the same or next day for X-rays or other checks. Rodents cannot vomit, so a swallowed foreign body can only pass naturally or be removed surgically. Record the size and number of droppings and his appetite to report at the visit. Rubber is not digested, and a blockage kills within days. Oil risks aspiration pneumonia and does nothing for a blockage. Withholding food makes a rat weaken rapidly and slows the gut further.

IssuesThe owner did not know that rats carry small items back as nesting material and left a rubber band within reach. The nest box was not checked after free-roam time, so the foreign object went unnoticed until the next morning.

ImprovementRemove rubber bands, plastic, small plastic pieces and cotton from the free-roam area. Use paper nesting material only and check the nest box contents after free-roam time. Check the size and number of droppings daily and treat a decrease as a cue to see the vet.

During free-roam time in the living room, your rat climbed a pothos pot on the floor and chewed several leaves. An hour later he keeps rubbing his mouth with his forepaws, is drooling, and will not eat. The inside of his mouth looks red and swollen. His breathing is normal and he is alert.

What is the most appropriate response?

1. Note the plant's name, take the chewed leaves with you, see the vet the same day, and watch the mouth swelling and his breathing
2. Flush his mouth forcefully with water and continue free-roam time until the symptoms pass
3. Plants are natural and therefore safe, so change his food and wait for his appetite to return
4. Apply human mouth-ulcer medication inside his mouth to relieve the pain

AnswerA. Note the plant's name, take the chewed leaves with you, see the vet the same day, and watch the mouth swelling and his breathing

ExplanationPothos and other aroid houseplants contain calcium oxalate, which causes severe pain, swelling and drooling in the mouth. If the swelling reaches the throat it causes breathing difficulty, so note the plant's name, bring the chewed leaves, and see the vet the same day. Until then, watch his breathing rate and whether he breathes with his mouth open, and switch to an immediate visit if he worsens. Forceful flushing causes aspiration, and continuing free-roam time risks a second dose. "Natural so safe" is wrong; many houseplants are toxic. Human mouth-ulcer medication contains steroids and other ingredients that are an overdose for a small rat.

IssuesThe manual's preparation for free-roam time, clearing away toxic houseplants, was neglected. The owner did not recognize that rats climb and that a pot on the floor was within reach.

ImprovementCheck the toxicity of houseplants in the home, and remove them all from the free-roam room or move them out of reach. Fence off the free-roam area. Make a habit of noting plant names so you can give the information quickly in case of poisoning.

You find your free-roaming mouse chewing a blood-pressure tablet dropped by your elderly grandmother. About a third of the tablet is gone, and your grandmother cannot clearly remember the drug's name. The mouse is still lively, but 10 minutes later starts to wobble and walk unsteadily.

What is the most appropriate response?

1. The wobbling just means she is sleepy, so return her to the nest box and let her sleep quietly
2. Give her a large amount of water to dilute the drug
3. Find the blister pack or prescription bag to identify the drug, and go to the vet immediately, including the emergency (after-hours) hospital
4. Wait until the clinic opens tomorrow morning and see the vet then if she has symptoms

AnswerC. Find the blister pack or prescription bag to identify the drug, and go to the vet immediately, including the emergency (after-hours) hospital

ExplanationFor a 25–50 g mouse, even a fragment of human medication can be a lethal dose. Blood-pressure drugs cause low blood pressure, slow heart rate and seizures, and the wobbling shows poisoning symptoms have already begun. Check the blister pack, prescription bag or medication record right away for the drug name and dose, and go to the vet immediately. At night, call the emergency hospital and report the drug name and her weight. Mistaking the wobbling for sleepiness and letting her sleep means she may lose consciousness. Large amounts of water cause aspiration and do almost nothing to reduce absorption. Rodents cannot vomit, so inducing vomiting is not possible either. Waiting until morning will be too late.

IssuesThe place where a family member handled medication overlapped with the free-roam area. The family did not understand how dangerous human drugs are to a small animal, and medication storage and pre-roam floor checks were inadequate.

ImprovementStore medication in lidded containers up high and separate the place where it is taken from the free-roam area. Check the floor at eye level before free-roam time. Know where the family's medication records are so you can report a drug name immediately if one is eaten.

Thinking "vegetables are healthy," a family member gave your rat leftover stir-fried vegetables (with onion and garlic chives) from dinner. The next day the rat is listless and his urine is browner than usual. His gums look pale and his breathing is slightly fast. He has eaten only about half his food and will not come down from the hammock.

What is the most appropriate response?

1. He is just tired, so cheer him up with his favorite sunflower seeds
2. Assume dehydration and put a sports drink in the water bottle
3. He ate it 2 days ago so it cannot be related; watch for a few days
4. Suspect onion poisoning, note what was given and how much, and see the vet the same day

AnswerD. Suspect onion poisoning, note what was given and how much, and see the vet the same day

ExplanationOnions, garlic chives and other allium vegetables destroy red blood cells and cause hemolytic anemia, with symptoms appearing 1 to several days after ingestion. Brown urine, pale gums, fast breathing and lethargy are typical of anemia and require a same-day visit. Note what was given, how much, and when, and tell the vet. Severe anemia is life-threatening from oxygen shortage. Sunflower seeds do nothing for anemia and are meaningless when he cannot eat. A sports drink has too much sugar and salt and is useless for anemia. Even days after ingestion the poisoning is still progressing, and watching for days could be fatal.

IssuesA family member gave human leftovers, and the knowledge that allium vegetables are toxic to rats had not been shared. The assumption that "vegetables are healthy" led to the wrong feeding.

ImprovementPost a list of forbidden foods (chocolate, onions/leeks, avocado, raw beans, etc.) on the refrigerator where the whole family can see it. Never give human leftovers. Base side food on species-specific pellets and give only a limited range of vegetables in small amounts.

One August afternoon, you went out with the air-conditioner timer having switched off, and came home to a room at 34°C. Your rat is lying flat on the floor breathing with his mouth open, his body is hot, and his chin is wet with drool. He responds sluggishly when called, and his ears and tail are red. The water in the bottle has gone lukewarm.

What is the most appropriate first action?

1. Move him to a cool room, wipe his body with a damp towel without wrapping him in it to cool him gradually, and go to the vet immediately
2. Submerge his whole body in ice water to bring the temperature down fast
3. Squirt cold water into his mouth with a dropper to rehydrate him
4. Turn on the air conditioner, leave the cage where it is, and watch until evening

AnswerA. Move him to a cool room, wipe his body with a damp towel without wrapping him in it to cool him gradually, and go to the vet immediately

ExplanationAbove 30°C there is a risk of heatstroke, and a hot, limp animal breathing with its mouth open falls under "call the vet now" in the manual. First move him to a cool room and wipe his body surface (ears, feet, tail) with a towel dampened with room-temperature water to cool him gradually by evaporation. At the same time contact an animal hospital, including the emergency (after-hours) hospital, and take care not to overcool him during transport. Ice water constricts the blood vessels, trapping heat inside, and the sudden cooling causes shock. Pouring water into the mouth of a sluggish animal causes aspiration. Just turning on the air conditioner and watching lets organ damage progress until it is too late.

IssuesThe owner went out in summer without checking the air-conditioner timer setting, creating a room above 30°C. There was no thermometer or cooling plate in place, and little understanding of the danger signs of heatstroke.

ImprovementIn summer, run the air conditioner continuously 24 hours a day and do not use the timer. Put a max/min thermometer beside the cage and check a smartphone-linked thermometer when out. Provide a cooling plate or a frozen plastic bottle wrapped in cloth, and decide where to evacuate in a power outage.

At 10 p.m. one January night, heavy snow causes a power outage and the heater and air conditioner stop. The room drops to 15°C within an hour, and power will not be restored until tomorrow noon. Your 3 mice are huddled and shivering in the nest box. You have disposable hand warmers and blankets but no heating appliance. The car cannot be used.

What is the most appropriate way to keep them warm?

1. Put disposable hand warmers directly inside the cage so the mice can cuddle up to them
2. Cover the cage with a blanket, stick hand warmers on the outside of a small box, add paper nesting material, and check every few hours until morning
3. Put a plastic bottle filled with hot water inside the nest box
4. Put all 3 in your pocket and warm them with your body heat overnight

AnswerB. Cover the cage with a blanket, stick hand warmers on the outside of a small box, add paper nesting material, and check every few hours until morning

ExplanationMice and rats need extra warmth below 18°C, and sustained 15°C leads to hypothermia and weakening. During an outage, insulate by covering the cage with a blanket and add paper nesting material so the 3 can huddle and share body heat. Stick hand warmers on the outside of a small box or the cage, warming gently where they cannot be touched directly. Hand warmers consume oxygen, so do not seal the cage; keep ventilation. Check the temperature and their condition every few hours. Hand warmers inside the cage get chewed, causing poisoning from the contents or low-temperature burns. A hot-water bottle causes burns, and if chewed and leaking, the wet mice lose even more heat. Pockets risk crushing, falls and escape.

IssuesThere was no preparation for a winter outage and no way to keep them warm without electricity. There may also have been no thermometer beside the cage to detect temperatures below 18°C.

ImprovementKeep disposable hand warmers, blankets, cardboard and paper nesting material as emergency supplies for outages. Put a thermometer beside the cage and set a rule to start warming below 18°C. Decide in advance where to evacuate in an outage (a relative's home, the car) and have a transport box ready.

A strong earthquake (intensity 5-upper) strikes late at night, and the rat cage on top of a shelf falls to the floor and its door comes open. The room is a mess and neither of your 2 rats can be seen. Aftershocks continue and the family is considering evacuating. You have a flashlight but the power is out, and the room door is standing open.

What is the most appropriate first action?

1. Leave the rats for later and head to the evacuation shelter with the family first
2. Move all the scattered objects while calling their names loudly and running around searching
3. Go out of the room to be safe from aftershocks and wait for the rats to come out on their own
4. Close the room door, make sure you are safe, then quietly search dark corners and nesting material, and set out an open transport box with favorite food

AnswerD. Close the room door, make sure you are safe, then quietly search dark corners and nesting material, and set out an open transport box with favorite food

ExplanationFirst ensure your own safety, then close the room door to limit the search area. Startled rats hide in dark, narrow places, so search quietly with a flashlight under scattered objects and in cloth. If you cannot find them, set out an open transport box with favorite food and wait for them to return. If you evacuate, close the room so you can come back for them. Leaving with the family first lets them escape through the open door, with no way to recover them. Shouting and running around drive them further into hiding and risk burying them under scattered objects. Just waiting outside the room risks them being crushed by objects falling in aftershocks.

IssuesThe cage was placed on top of a shelf, where it could easily fall, with no anti-tip measures. There was no transport box or evacuation plan, and the family had not decided how to handle the pets in an earthquake.

ImprovementPlace the cage on the floor or a low stand, secure it with anti-tip fittings, and fit a latch on the door. Keep a transport box and emergency food, water and paper nesting material together beside the cage. Check in advance which shelters accept pets and assign roles for an earthquake.

It is June, it has rained for days, and the room humidity is over 80%. The rat cage smells moldy, and a corner of the bedding is damp and blackened. One rat is sneezing, and the other is scratching the back of its neck and has a scab. Opening the windows does not bring the humidity down.

What is the most appropriate response?

1. Replace all the bedding, wash the cage, bring the humidity down to 40–60% with a dehumidifier or air conditioner, and see the vet within a few days if symptoms continue
2. Humidity is natural, so hold off on cleaning until it clears up to avoid stressing them
3. Point a fan directly at the cage to dry it out
4. Spray disinfectant directly inside the cage to kill the germs

AnswerA. Replace all the bedding, wash the cage, bring the humidity down to 40–60% with a dehumidifier or air conditioner, and see the vet within a few days if symptoms continue

ExplanationAs the manual says, 40–60% humidity is correct, and high humidity causes skin and respiratory disease. Mold and damp bedding breed fungi and bacteria, and the sneezing and scabby skin are signs the effects have begun. Replace all the bedding, wash the cage and dry it completely, and lower the humidity with a dehumidifier or the air conditioner's dry mode. If the sneezing or scratching continues, see the vet within a few days. Holding off on cleaning lets the mold grow and worsens things. A fan aimed directly at them drains body heat and the draft stresses and irritates the airways. Disinfectant spray is inhaled and licked, causing poisoning.

IssuesThere was no hygrometer and no awareness that rainy-season humidity causes disease in rats. The environmental changes of damp bedding and odor were left until symptoms appeared.

ImprovementPut a thermo-hygrometer beside the cage and keep 40–60% with a dehumidifier or air conditioner. In the rainy season, clean at least twice a week, lay bedding thickly, and remove damp patches daily. Keep the cage in a well-ventilated spot away from walls.

A typhoon threatens to flood the river and an evacuation order has been issued. The shelter is a 20-minute walk away, the rain is heavy and it is 12°C. You want to take your 2 rats, but the large cage cannot be carried. You have a small plastic bug box, towels, pellets, a water bottle and plastic bags.

What is the most appropriate transport preparation?

1. Wrap the rats in a towel, put them in your coat pocket, and evacuate empty-handed
2. Line the bug box with a towel, put both rats in, use a plastic bag to keep off the rain while leaving ventilation holes clear, and take the pellets and bottle
3. Seal the bug box completely in a plastic bag to keep the rain off
4. Leave the rats at home with several days' food and water in the cage, and evacuate

AnswerB. Line the bug box with a towel, put both rats in, use a plastic bag to keep off the rain while leaving ventilation holes clear, and take the pellets and bottle

ExplanationA small, dark container that keeps them calm is best for transport; lining the bug box with a towel and putting both rats in lets them keep each other warm. Getting wet in 12°C rain causes rapid hypothermia, so keep the rain off with a plastic bag but always leave ventilation holes clear. Take the pellets, water bottle and a spare towel, and at the shelter keep them in a quiet, warm spot. A pocket carries a high risk of crushing, falls and escape, with no food or water. A sealed bag suffocates them. Left at home they could drown in flooding, temperature control fails in an outage, and even with days of food and water they could die from a blocked bottle or spoiled food.

IssuesNo transport supplies or evacuation plan had been prepared for a disaster, so the owner had to improvise with what was on hand. The owner had not checked whether pets could be taken to the shelter or what small animals need for warmth and ventilation during transport.

ImprovementKeep a ventilated carrier, towels, 3 days of pellets, a water bottle and hand warmers together in an emergency bag. Check in normal times whether the shelter accepts pets. Practice sticking a hand warmer on the outside of the box and combining a rain cover with ventilation.

Three days ago your rat bit your index finger hard while you were cleaning the cage. It bled, but you just wiped it off. This morning the finger is red, swollen and hot, you have a fever of 38.5°C and joint pain, and a small rash has appeared on the back of your hand. The rat itself is lively and normal.

What is the most appropriate response?

1. Since the rat is healthy, infection can be ruled out; take over-the-counter fever medicine and watch
2. Take the rat to the public health center to be put down
3. See a doctor, report the bite history, and get treatment for rat-bite fever or similar
4. Ice the swollen finger and rest at home until the fever goes down

AnswerC. See a doctor, report the bite history, and get treatment for rat-bite fever or similar

ExplanationAs the manual says, fever, rash and joint pain a few days after a rat bite are typical symptoms of rat-bite fever. The causative bacteria normally live in a rat's mouth and the rat is usually symptom-free, so a healthy rat does not rule out infection. See a doctor, report the bite history, and get antibiotic treatment. Ask about tetanus too. Left untreated it can become serious, including endocarditis. Over-the-counter fever medicine and icing do nothing for the infection itself and delay the visit. There is no need to put the rat down; it is prevented by avoiding bites and treating wounds properly. In future, wash any bite under running water for 5 minutes and disinfect it.

IssuesThe basic step of washing the bite under running water for 5 minutes and disinfecting it was skipped. The owner did not know that rat bites are a route for zoonotic disease and could have mistaken the early symptoms for a cold.

ImprovementIf bitten, immediately wash under running water for 5 minutes and disinfect; if fever, rash or joint pain appears, see a doctor and report the bite history. Wear gloves when cleaning and speak before putting your hand in so as not to startle the rat. Check your tetanus vaccination status.

Your child picked up a weak wild mouse at the park and carried it home bare-handed. The child says "I want to keep it with our rat" and has already put it in a cardboard box next to the rat's cage. The wild mouse has eye discharge and what look like mites on its body. The child has a scratch on one hand.

What is the most appropriate response?

1. Put it in the same cage as the rat so they can be friends, and keep it until it recovers
2. Keep the wild mouse in isolation in another room and introduce it to the rat once it recovers
3. Feed it rat food to build its strength before returning it to where it was found
4. Move the wild animal away from the rat and handle it with gloves, wash the child's hands and seek advice about the scratch, and consult the authorities or an animal hospital about what to do with it

AnswerD. Move the wild animal away from the rat and handle it with gloves, wash the child's hands and seek advice about the scratch, and consult the authorities or an animal hospital about what to do with it

ExplanationWild mice carry hantavirus, leptospira, skin parasites and more, and can infect both the household rat and people. As the manual says, never catch and keep wild animals; move it away from the rat at once and handle it only with gloves, never bare hands. Wash the child's hands under running water, disinfect the scratch, and consult a doctor. Consult the municipal office or an animal hospital about what to do with the animal, and disinfect the cardboard box and everything it touched. Housing it together or keeping it in another room only prolongs the chance of infection. Feeding it before releasing it also continues the exposure of the family and the household rat and should be avoided.

IssuesThe child had not been taught the danger of handling wild mice bare-handed or the risk of infecting the household rat. Putting it beside the cage had already created a risk of contact.

ImprovementShare the rule with your child of never touching or bringing home wild animals, and teach them to tell an adult if they find one. After any contact with a wild animal, wash hands and change clothes thoroughly, and make a habit of always washing hands before handling the rat's cage.

On Sunday at midday, after cleaning the cage of your 5 mice, you ate rice balls for lunch without washing your hands. From the evening, 2 family members have diarrhea, stomach pain and fever. One of the mice has had soft stool and a dirty rear end for a few days. The bedding was handled bare-handed during cleaning.

What is the most appropriate plan going forward?

1. The family sees a doctor and reports keeping animals; cleaning is always done with gloves and followed by handwashing; the mouse with soft stool is isolated and taken to the vet
2. The mice may not be the cause, so keep husbandry unchanged and just have the family see a doctor
3. Stop caring for the mice and do not touch the cage until the family recovers
4. Give all the mice a human probiotic to settle their guts

AnswerA. The family sees a doctor and reports keeping animals; cleaning is always done with gloves and followed by handwashing; the mouse with soft stool is isolated and taken to the vet

ExplanationOral infection from hands that touched feces is the classic route for salmonellosis, and the manual says to wash hands after handling and not to eat right after cleaning the cage. The family should see a doctor and report keeping animals; cleaning should be done with gloves, followed by handwashing, and never followed directly by eating. The mouse with soft stool may be the source, so isolate it and have the vet run a fecal test. If husbandry does not change, it will recur. Stopping care weakens the mice and lets the cage become more contaminated. A human probiotic is unsuitable for a 25–50 g mouse and does not diagnose the cause.

IssuesThere was no basic hygiene habit of washing hands after cleaning, and bedding was handled bare-handed. The mouse with soft stool was not isolated and was left as a source of infection for the other mice and for people.

ImprovementWear gloves when cleaning and wash hands with soap before eating afterward. Isolate any animal with soft stool or a dirty rear in a spare cage and take it to the vet with a stool sample. With several animals, check their health daily and disinfect the cage at least once a week.

You cleaned your 3 rats' cage for the first time in a week, clearing urine-soaked bedding bare-handed with chapped, cracked fingers. A week later you have a severe headache, chills, muscle aches and red eyes; you thought it was a cold, but over-the-counter medicine does not help. The rats are lively and show nothing unusual.

What is the most appropriate response?

1. Decide it is a cold, take more over-the-counter medicine, and rest until it passes
2. Getting rid of the rats will cure it, so have the public health center take them
3. See a doctor, report keeping animals and the contact with urine, and get tested for leptospirosis and similar
4. The rats' urine is the cause, so give the rats antibiotics

AnswerC. See a doctor, report keeping animals and the contact with urine, and get tested for leptospirosis and similar

ExplanationLeptospirosis spreads through contact with the urine of infected rats or contaminated bedding and enters through broken skin. The manual says to wear gloves when cleaning and not to handle with cut hands. Rats are often symptom-free carriers, so they can be a source even when lively. Headache, chills, muscle aches and red eyes are early symptoms of leptospirosis, and it can progress to jaundice and kidney failure, so see a doctor, report keeping animals and the contact with urine, and get early antibiotic treatment. Over-the-counter medicine does not cure it and it worsens. There is no need to get rid of the rats; better hygiene prevents it. Medicating the rats on your own judgment is not treatment.

IssuesCleaning was left a whole week, allowing a lot of urine to build up. The basic zoonosis precaution was ignored by touching urine bare-handed with chapped skin, and self-diagnosing a cold delayed the doctor's visit.

ImprovementClean at least twice a week, always wearing gloves, and take extra care when you have cuts on your hands. Always wash hands with soap after cleaning. If anyone caring for animals develops an unexplained fever or illness, always tell the doctor about the animals.

This morning your 2.5-year-old rat is lying outside the nest box. She does not respond to her name or to touch, but her body is still warm. From a distance you cannot tell whether her chest is moving. Her cagemate is nudging her. The family says "she's already dead," but you are not sure.

What is the most appropriate first action?

1. Hold a mirror to her mouth and judge only by whether it fogs
2. Shake her hard to wake her and pour water into her mouth
3. Decide she is dead, put her in a box, and prepare for burial
4. Separate her from the cagemate, check for chest movement and feel for a heartbeat with a finger on the chest, and if present, keep her warm and go to the vet immediately

AnswerD. Separate her from the cagemate, check for chest movement and feel for a heartbeat with a finger on the chest, and if present, keep her warm and go to the vet immediately

ExplanationFollowing the manual's CPR steps, first check consciousness, breathing and heartbeat. Check breathing by chest movement; a rat breathes 70–110 times per minute. Check the heartbeat with a finger on the chest; at 250–450 beats per minute it is very fast, so judge by whether there is movement at all. While the body is warm there is a chance of survival; if there is breathing or a heartbeat, keep her warm in a small box and go to the vet immediately. If breathing has stopped, cover the nose and mouth with a cloth and breathe gently; if the heart has stopped, give chest compressions with a thumb at 200+ per minute for 1 minute and continue while transporting. A mirror alone cannot detect a small animal's faint breathing. Shaking her and pouring in water causes aspiration. Declaring death without checking throws away the chance to save her.

IssuesThe family did not know how to check consciousness, breathing and heartbeat and tried to declare death on appearance alone. No resuscitation steps or transport preparation had been shared for a sudden decline in an elderly rat.

ImprovementPractice checking breathing, heartbeat and consciousness (chest movement, finger on the chest, calling and touching) in normal times. Print the manual's CPR steps and keep them beside the cage, and make a morning check for signs of life a habit with elderly animals. Post your regular vet's and the emergency hospital's numbers.

Your mouse chewed the heater cord, got an electric shock, and collapsed on the floor. You turned off the power and moved her away, but her chest is not moving and she is not breathing. With a finger on her chest you feel a faint, fast beat. The animal hospital is 15 minutes away by car, and a family member can drive. The mouse weighs 35 g.

What is the most appropriate action at this point?

1. Cover her nose and mouth with a cloth and breathe gently into them, have a family member drive, and keep it up during transport
2. Since there is a heartbeat, do nothing and wait in the car for breathing to return on its own
3. Press hard on her chest with both thumbs, compressing as deep as you would for a person
4. Drip water into her mouth to revive her and see the vet once she wakes up

AnswerA. Cover her nose and mouth with a cloth and breathe gently into them, have a family member drive, and keep it up during transport

ExplanationA heartbeat with breathing alone stopped is the situation where rescue breathing is most likely to bring recovery. As the manual says, cover the nose and mouth with a cloth and breathe gently. A 35 g mouse's lungs hold very little, so give only a tiny puff from your cheeks. Chest compressions are only for cardiac arrest and are not needed while there is a heartbeat. Have a family member drive, keep her warm in a dark small box, continue rescue breathing during transport, and switch to thumb compressions at 200+ per minute if the heart stops. Doing nothing leads to cardiac arrest within minutes. Human-depth compressions destroy the ribs and organs. Dripping water causes aspiration and is meaningless for an unconscious animal.

IssuesThe heater cord had no cover and was within chewing reach. The manual's basic safety measures, covering electrical cords because they chew them and positioning heaters where they cannot be touched, were missing.

ImprovementCover all electrical cords inside and outside the cage, and install the heater outside the cage with the cord routed where it cannot be chewed. Review rescue breathing and chest compressions as a family in normal times so that driving and treatment can be shared during transport.

Your rat fell from the top level of a multi-level cage, caught the last 3 cm of his tail on the wire, and cut it; blood is dripping. The bedding is stained red and the rat is running around spreading blood. You pressed with a tissue, but when you let go after 1 minute it started bleeding again. The rat is agitated and will not settle.

What is the most appropriate response?

1. Let him run freely until the bleeding stops and his agitation subsides
2. Wrap him in a cloth to restrain him, press the wound with clean gauze for 5 minutes, apply gentle pressure at the base of the tail, and if it does not stop, keep pressing and go to the vet
3. Tie a rubber band tightly around the base of the tail to stop the blood completely
4. Rub flour into the wound to clot the blood

AnswerB. Wrap him in a cloth to restrain him, press the wound with clean gauze for 5 minutes, apply gentle pressure at the base of the tail, and if it does not stop, keep pressing and go to the vet

ExplanationThe manual's bleeding procedure is to press with clean gauze for 5 minutes, apply gentle pressure at the base of the tail for tail bleeding, and keep pressing and transport if it does not stop. Letting go after 1 minute causes rebleeding before a clot forms, so watch the clock and do not let go for 5 minutes. Wrapping him in a cloth calms him and makes restraint easier. Running raises his heart rate, increases bleeding, and contaminates the wound. A tight rubber band stops blood flow completely and leads to tissue death and amputation of the tail. Flour stays in the wound as a foreign body, causes infection, and gets in the way of the vet's treatment. Even after the bleeding stops, see the vet the same or next day about the tail wound to check for tissue death.

IssuesNo cloth was laid on the landing surfaces of the multi-level cage, and a structure where the tail could catch on wire was left in place. The owner did not know the basic rule of pressing for a full 5 minutes and checked too soon, causing rebleeding.

ImprovementPut cloth on the landing surfaces of a multi-level cage, reduce height differences, and cover wire sections with boards or cloth. Keep gauze and styptic powder in the first-aid kit and practice timing 5 minutes of pressure by the clock. Tail wounds risk tissue death, so see the vet even after the bleeding stops.

It is 11 p.m. on Saturday, and your 18-month-old rat has not eaten since the evening and has passed no stool. He sits hunched and still, but his breathing is calm, with no open-mouth breathing or blue lips. He has enough energy to resist and move away when touched. Your regular vet is closed until Monday, and the emergency (after-hours) hospital is 40 minutes away by car.

What is the most appropriate judgment at this point?

1. The emergency hospital is overkill, so wait for the regular vet on Monday
2. Order medication you found online and watch until it arrives
3. Since this meets the same-day criteria, call the emergency hospital, describe the symptoms, and either go as instructed or find a clinic that can see him first thing in the morning
4. Wait until he breathes with his mouth open, and go to the emergency hospital then

AnswerC. Since this meets the same-day criteria, call the emergency hospital, describe the symptoms, and either go as instructed or find a clinic that can see him first thing in the morning

ExplanationThe manual's triage classes "not eating for 1 day or no stool" as a same-day visit, and "open-mouth breathing, blue lips or seizures" as call the vet now. This is not yet an emergency, but rats are small and can change within hours, so waiting until Monday is too long. Call the emergency hospital, describe the symptoms, ask whether a visit is needed and what to watch for at home, and find a clinic open on Sunday that can see him first thing. Until then, keep him warm with food and water within reach, watch his breathing and stool, and transport him immediately if he worsens. Medication ordered online is dangerous without a diagnosis and takes time to arrive. Waiting for open-mouth breathing means acting only once it is an emergency, which is usually too late.

IssuesThe owner knew the regular vet's closed days but had not prepared information on alternative clinics or the emergency hospital. The distinction between same-day and call-now was vague, and there was a habit of waiting until things became an emergency.

ImprovementPrint and post the triage criteria (now / same day / within a few days). Mark your regular vet's closed days on the calendar, and note the contact details and travel time for a Sunday clinic and the emergency hospital. Share the principle with the family that when in doubt, call and ask.

Your 2-year-old rat suddenly had a seizure, and even after it stopped he is not fully conscious. You called the emergency (after-hours) hospital and were told to bring him in right away. It is a 30-minute drive, and it is January and 3°C outside. You have a shoebox, a towel, disposable hand warmers and a dish of water. A family member will drive and you will ride along.

What is the most appropriate way to transport him?

1. Hold him on your lap, stroking him and talking to him the whole way to keep him conscious
2. Put hand warmers and the water dish inside the shoebox and turn the car heater to maximum
3. Wrap him in a towel and carry him on your shoulder so you can see any change in consciousness right away
4. Line the shoebox with cloth, stick hand warmers on the outside of the box, keep it dark and quiet, and hold it on your lap to absorb the jolts

AnswerD. Line the shoebox with cloth, stick hand warmers on the outside of the box, keep it dark and quiet, and hold it on your lap to absorb the jolts

ExplanationAs in the manual's transport method, line a small box with cloth and stick hand warmers on the outside to warm it gently. Keeping it dark and quiet reduces stimulation and helps prevent another seizure, and holding it on your lap absorbs the jolts. Make ventilation holes in the box, and do not put in a water dish, which would spill with the motion, wet him and cause hypothermia. Holding a semi-conscious animal directly on your lap or shoulder risks a fall if a seizure recurs, and light and voices can trigger a seizure. Hand warmers inside the box cause low-temperature burns or poisoning if chewed open. Maximum car heating causes dryness and overheating. Record the time and number of seizures to tell the vet.

IssuesNo transport box had been prepared, so the owner had to improvise on the day. There was insufficient understanding that reducing stimulation is essential for a seizing animal.

ImprovementKeep a small transport box, cloth, disposable hand warmers and a ventilated carrier as a standing first-aid kit. During seizures, keep things dark and quiet, avoid stimulation, and record the time, duration and number. Check the route and travel time to the emergency hospital in normal times.

One July midday, direct sunlight has been hitting the cage by the window, and your mouse is stretched out limp on the floor. Her body is hot and her breathing is fast and shallow. She moves slightly when touched but cannot get up. You called the animal hospital and were told to come right away while cooling her. It is a 20-minute drive. You have ice packs, towels and a small box.

What is the most appropriate treatment during transport?

1. In a cool room, wipe her body with a towel dampened with room-temperature water, wrap the ice packs in towels and place them outside the box, and watch that she does not get too cold on the way
2. Hold the ice packs directly against her body and keep cooling her whole body in the car
3. Submerge her in cold water, then put her in the box still wet and go
4. Cooling will give her a cold, so just put her in the box as she is and hurry

AnswerA. In a cool room, wipe her body with a towel dampened with room-temperature water, wrap the ice packs in towels and place them outside the box, and watch that she does not get too cold on the way

ExplanationA hot, limp animal with heatstroke is a call-the-vet-now emergency, and gentle cooling should continue during transport. Wipe the ears, feet and tail with a towel dampened with room-temperature water to cool by evaporation. Wrap the ice packs in towels and place them outside the box or in a corner, never directly against her body. A 25–50 g mouse chills quickly too, so stop cooling if she starts shivering. Ice packs against the body cause low-temperature burns and sudden blood-vessel constriction that traps heat, then overcooling and hypothermia. Submerging in cold water causes shock, and staying wet keeps draining body heat. Transporting without cooling lets organ damage progress. Watch her breathing for changes until you arrive.

IssuesThe cage was placed by the window in direct sunlight. The manual's basic placement rule, away from direct sunlight and drafts from heaters or air conditioners, was not followed, and awareness of summer heatstroke risk was lacking.

ImprovementMove the cage out of direct sunlight and keep 20–26°C with air conditioning in summer. Put a thermometer beside the cage and treat above 30°C as the danger line. Prepare a cooling plate or a frozen plastic bottle wrapped in cloth, and share the gentle cooling method for heatstroke with the family.