African pygmy mouse case method: 50 questions

7 a.m. in January. The heating was turned off overnight and the room is 15°C. Of four 1-year-old pygmy mice kept in a tank, one is curled up motionless in a corner outside the nest. A gentle poke with a finger produces a slight leg movement, but the body is clearly cold to the touch. The other three are huddled asleep inside the nest.

Which is the most appropriate first action?

1. Cup it in both hands and blow on it to warm it up quickly
2. Place a towel-wrapped hot-water bottle at about 30°C under the nest, warm slowly and watch for 30 minutes
3. Aim a hair dryer's warm air directly at it to restore body temperature
4. It will wake on its own, so just raise the room temperature and wait until noon

AnswerB. Place a towel-wrapped hot-water bottle at about 30°C under the nest, warm slowly and watch for 30 minutes

ExplanationA pygmy mouse weighing a few grams has a large surface area relative to its body and slips into hypothermia within hours below 20°C. Rapid warming opens peripheral blood vessels first, dropping blood pressure and straining the heart, so gentle warming with a hot-water bottle through a towel is correct. If there is no response within 30 minutes, go to the vet immediately. Cupping in the hands adds stress from grip pressure and the temperature difference, and a hair dryer causes burns and dehydration. Waiting until noon is dangerous because advancing hypothermia shuts down temperature regulation and leads to death.

IssuesTurning off the heating overnight let the room drop far below the proper range (24–28°C). There was no constant heat source such as an under-tank heater, and the owner did not know how quickly a small rodent chills in winter. Not noticing the animal away from the nest until morning was also a problem.

ImprovementIn winter, install an under-tank heater beneath the case to create a temperature gradient. Place a thermometer in the cage and make a habit of checking it before bed and on waking. Use an insulating cover on cold nights and look up the after-hours contact for a hospital that sees small animals in advance.

An August evening. Returning from work, you find your 2-year-old pygmy mouse lying limp on the bedding. Its eyes are sunken, its fur is ruffled, and when you gently tent the skin on its back it is slow to return. Pressing the water bottle with a finger produces no water; the ball is stuck. You do not know when it last drank.

Which is the most appropriate first action?

1. Squirt water into its mouth with a dropper and make it drink as much as possible
2. Put undiluted sports drink in a dish and leave it
3. Fix the bottle and watch until the next morning
4. Put a drop of water by its mouth to see if it licks on its own, keep it warm and see a vet the same day

AnswerD. Put a drop of water by its mouth to see if it licks on its own, keep it warm and see a vet the same day

ExplanationAn animal weighing a few grams holds very little body water, and dehydration becomes life-threatening within hours. If it is conscious, letting it lick on its own is safe; pouring water into the mouth risks aspiration into the lungs. Body temperature also drops easily with dehydration, so keep it warm and take it the same day to a hospital that can give subcutaneous fluids. Undiluted sports drink is too high in sugar and salt and burdens the gut. Waiting until morning lets kidney damage progress and makes recovery harder.

IssuesThere was no habit of checking the bottle flow daily, so the stuck ball went unnoticed. In midsummer, when water consumption rises, no backup water source was provided. The setup gave no way to detect a cage problem during the long hours before getting home.

ImprovementEvery morning press the bottle tip with a finger to confirm water comes out, and change the water daily. Install two bottles as insurance against failure. Give a small amount of moisture-rich food such as vegetables every day, with extra care in summer. Remember sunken eyes and slow skin return as signs of dehydration.

Late at night in November, sleeping near the cage, you hear a small popping and clicking sound repeating. When you turn on the light, your 1.5-year-old pygmy mouse is sitting with its fur puffed up and its eyes narrowed. The area around its nose is slightly damp. You switched the bedding to softwood shavings just last week.

Which is the most appropriate first action?

1. Crush a rice-grain-sized piece of human cold medicine into its food
2. Turn a humidifier to maximum and aim the steam directly at the cage
3. Move the cage to a quiet, warm place, remove the dusty bedding and see a vet the same day
4. It is only squeaking, so ignore it until morning

AnswerC. Move the cage to a quiet, warm place, remove the dusty bedding and see a vet the same day

ExplanationBreathing sounds, nasal discharge and a puffed-up posture are classic signs of respiratory infection in rodents, and a small mouse can progress to pneumonia within days. First remove the irritant, the dust and volatile compounds of the softwood shavings, keep it warm and quiet, and see a vet the same day. Human cold medicine is wrong in both ingredients and dose and causes poisoning. Steam aimed directly at the cage makes it stuffy, promotes bacteria and also lowers body temperature. Mistaking breathing sounds for squeaking and leaving it leads to a case that is too late to treat.

IssuesThe owner changed the bedding without knowing that volatile compounds and dust from softwood shavings irritate a small rodent's airways. Breathing sounds were not recognized as abnormal because there was no baseline for observation. The infection risk to cage mates was also not considered.

ImprovementUse paper or aspen bedding and avoid softwood shavings and scented products. Clean at least once a week to keep ammonia down. Learn breathing sounds, nasal discharge and squinting as signs of respiratory disease; isolate an affected animal in a separate cage and check cage mates daily.

A May morning. The tail base of your 9-month-old pygmy mouse is wet and soiled with stool, and there are several watery droppings on the bedding. Yesterday you gave it a generous amount of lettuce and cucumber left over from dinner. It is moving, but spends longer than usual holed up in the nest and the food is going down more slowly.

Which is the most appropriate first action?

1. Stop vegetables, give staple food and water only, photograph the stool, weigh it, and see a vet the same day if it worsens
2. Dissolve human anti-diarrheal medicine in water and make it drink
3. Assume it is short on fluids and give more watery fruit
4. Let it lick yogurt to settle its gut

AnswerA. Stop vegetables, give staple food and water only, photograph the stool, weigh it, and see a vet the same day if it worsens

ExplanationA sudden large amount of watery vegetables easily causes soft stool in small rodents. Stop the vegetables responsible, return to a pellet-based diet, and record photos of the stool and the weight. If it becomes listless, passes bloody stool or the watery stool continues, see a vet the same day. Human anti-diarrheals stop gut movement and trap toxins, and can be a lethal dose in such a tiny body. More fruit worsens the diarrhea and dehydration. Dairy does not suit a mouse's digestion and disrupts the gut flora. Remember that in an animal of a few grams, dehydration from diarrhea enters the danger zone within half a day.

IssuesLeftover human vegetables were given without thought to quantity or freshness. The owner did not know the basic rule of introducing dietary changes gradually in small amounts. There was little awareness that diarrhea leads rapidly to dehydration in small animals.

ImprovementGive vegetables at about a pinkie-nail-sized portion per animal, fresh only, and remove leftovers the same day. Weigh weekly and record it to catch changes. Check stool every morning, and set a rule to see a vet the same day for watery or bloody stool or a soiled tail base.

March. Two weeks ago you added a young pygmy mouse newly bought from a pet shop to your existing group of four. Today two animals, including the newcomer, are scratching their ears and necks furiously; the skin along the ear edges has thickened and scabbed, and the fur is thinning. The others still look symptom-free.

Which is the most appropriate first action?

1. Spray a flea spray for dogs over the whole cage
2. Apply a human anti-itch ointment to the ears
3. It is shedding season, so leave it alone
4. Move the affected animals to a separate cage using gloves, replace all the bedding, and have a skin examination at an animal hospital

AnswerD. Move the affected animals to a separate cage using gloves, replace all the bedding, and have a skin examination at an animal hospital

ExplanationExternal parasites such as mites and ringworm fungus spread quickly in group housing. Isolating the symptomatic animals, replacing all the bedding to reduce the source, and having a vet identify the cause and treat it properly is correct. Dog insecticide sprays are lethal to a mouse weighing a few grams and also cause poisoning when licked. Human ointments are licked off during grooming and some ingredients are harmful. Left alone, it spreads to the whole group and scratching causes secondary infections. Wear gloves because the skin disease may be transmissible to humans.

IssuesThe newcomer was added directly to the group without a quarantine period. There was no habit of checking the body surface daily, so detection was delayed. The owner did not understand that dog and cat products cannot be used on small rodents.

ImprovementQuarantine new animals in a separate cage for 2 weeks and observe skin, stool and appetite before introducing them. At the weekly weigh-in, check for hair loss, scabs and thickened skin. Use only medication prescribed by a vet who sees small animals, and never use over-the-counter insecticides.

Two weeks ago you found a lump the size of a grain of rice on the right flank of your 2.5-year-old female pygmy mouse. Today it has grown to the size of a soybean, and her body tilts when she walks. She still has an appetite, but she chews at the lump when grooming. The surface is not red.

Which is the most appropriate first action?

1. Squeeze the lump with your fingers to push out the contents
2. She is old, so let nature take its course and reconsider if anything changes
3. Take her to a hospital that sees small animals with photos and weight records and discuss a treatment plan
4. You heard warming shrinks it, so warm it with a hot-water bottle

AnswerC. Take her to a hospital that sees small animals with photos and weight records and discuss a treatment plan

ExplanationMice develop tumors frequently, and showing the vet while a lump is still small widens the options: assessing anesthesia risk, deciding whether removal is possible, and managing pain. Squeezing damages tissue, causes bleeding and infection, and may spread the tumor. Warming does not shrink tumors. Even in an elderly animal, pain and self-injury can be managed, so leaving it is inappropriate. Record the change in size and see a vet before walking or eating is affected. Rapid growth or self-chewing means a visit within a few days.

IssuesThe owner did not see a vet when the lump was first found and watched it for two weeks. There was no awareness that tumors are common in mice, and an assumption that small animals cannot have surgery. The sign of self-injury was overlooked.

ImprovementAt the weekly weigh-in, quickly check the whole body surface; if you find a lump, record its size and see a vet right away. Find a hospital that handles small-animal tumors in advance. For elderly animals, reduce steps in hides and learn the signs of pain (hunching, ruffled coat, self-injury).

A 1.5-year-old pygmy mouse that you weigh every week. In three weeks it has dropped from 7 g to 5.5 g. The food in the dish goes down as before and it still comes to the feeding spot. But it eats more slowly than before, picking up pellets and dropping them. The fur on its chin is damp with drool. Its droppings are small and hard.

Which is the most appropriate first action?

1. Increase high-calorie food such as sunflower seeds to fatten it up
2. Suspect a dental problem, prepare softened pellets and see a vet within a few days
3. It is eating, so there is no problem; stop weighing it
4. Open its mouth yourself and trim the teeth

AnswerB. Suspect a dental problem, prepare softened pellets and see a vet within a few days

ExplanationPicking up and dropping food, slow eating and drooling are classic signs of malocclusion or an oral problem in rodents; it looks as if it is eating but is actually not taking food in. Secure nutrition with softened pellets and see a hospital that can examine the mouth within a few days. More hard seeds cannot be chewed and only add fat. Trimming teeth yourself damages the roots and jaw, causing bleeding and infection. Weight loss with unchanged intake is evidence of disease, and stopping the weigh-ins is the most dangerous choice.

IssuesDespite objective weight-loss data, the owner was reassured by the food going down. There was no knowledge linking changed eating, drooling and smaller droppings to dental problems. Wooden items for gnawing may also have been lacking.

ImprovementTreat a 20% weight loss as a serious warning and investigate the cause. Always provide twigs and wooden hides to encourage tooth wear. Add how it eats (picking up, dropping, chewing on one side) to your observation checklist. Learn how to prepare softened pellets so you can make them immediately in an emergency.

A June night. Of five pygmy mice that normally sleep huddled together in the nest, one is sitting still with its fur standing on end in a corner by the feeding spot, away from the nest. The others are busily running on the wheel. Last night it was moving normally. Its eyes are half-closed and it shows no sign of fleeing when you approach.

Which is the most appropriate first action?

1. Assume the others drove it out and put it back among the group
2. It is just sleepy, so turn off the light and leave it
3. Give it extra sunflower-seed treats to cheer it up
4. Move it to a separate small warmed box, observe, and see a vet first thing in the morning

AnswerD. Move it to a separate small warmed box, observe, and see a vet first thing in the morning

ExplanationFor a group-living pygmy mouse, leaving the others, sitting with fur raised and not fleeing is the clearest sign of illness. A weakened animal gets shoved aside or trampled in the group, so isolate it in a warm small box, keep it quiet and see a vet first thing in the morning. Returned to the group, a weak animal only drifts away again and is harder to observe. Looking sleepy but not fleeing is abnormal, and leaving it is dangerous. A weakened animal cannot eat high-fat treats, which only burden digestion.

IssuesThe owner did not recognize leaving the group as a sign of disease, and did not know that a weak animal left in the group can be neither observed nor kept warm. No isolation box or warming equipment was ready for a sudden decline.

ImprovementMake 'is it with the group?' and 'does it flee?' part of the nightly check. Keep a small isolation box that can be warmed, a towel and a hot-water bottle on hand so you can isolate immediately. Post the hours and contact of a hospital that sees small animals near the cage.

A September evening. The left eye of your 1-year-old pygmy mouse stays shut, and the area around the eyelid is swollen and moist. The right eye is open. It keeps rubbing its face with its front paws. When you cleaned the cage yesterday you added fresh hay. The three cage mates show nothing unusual.

Which is the most appropriate first action?

1. Put in one drop of human eye drops and watch
2. Tape the front paws so it cannot rub the eye
3. Do not force the eye open; temporarily remove the hay that rubs against it and see a vet the same day
4. Open the eye with your fingers and remove the debris inside

AnswerC. Do not force the eye open; temporarily remove the hay that rubs against it and see a vet the same day

ExplanationOne-sided swelling and a closed eye suggest a corneal scratch from a hay stalk, conjunctivitis, or occasionally a tooth-root problem. Forcing the eye open enlarges the injury, so remove the irritant and have the eye examined the same day at a hospital that can do so. Human eye drops have unsuitable ingredients and the preservatives have a large effect on an animal of a few grams. Taping the paws causes extreme stress and fractures, and prying the eye open to pick out debris scratches the cornea. Eye disease can lead to blindness within days, so do not put it off to the next day.

IssuesHay was added as is, without considering that stiff stems can injure a small animal's eye. The owner took the eye problem lightly and nearly tried home treatment. No small-animal hospital able to examine eyes had been identified.

ImprovementChoose the soft parts of hay and cut stiff stems and long leaves short before adding. Make a same-day vet visit the rule for any eye problem, even one-sided. Find a hospital that can examine small-animal eyes, and get in the habit of photographing the eye without touching it and bringing the photo.

A 2-year-old female pygmy mouse. For a week, only the left side of her abdomen has been swollen; today she walks dragging her belly and will not leave the nest. You assumed pregnancy, but her cage mates are all female. She eats only a little. She hunches and resists when her belly is touched, and her breathing is fast.

Which is the most appropriate first action?

1. Consider pregnancy, add nesting material and wait
2. Massage the belly to push out the contents
3. Suspect a one-sided tumor or an ovarian or uterine problem, keep her warm and see a vet the same day
4. Decide it is constipation and give olive oil

AnswerC. Suspect a one-sided tumor or an ovarian or uterine problem, keep her warm and see a vet the same day

ExplanationPregnancy is impossible in an all-female group, and one-sided abdominal swelling suggests a tumor, ovarian or uterine disease, or an enlarged organ. Hunching in pain and fast breathing are highly urgent; keep her warm, see a vet the same day and have the cause investigated with imaging. Adding nesting and waiting only lets it worsen, and massage risks rupturing a tumor or damaging organs. Forcing oil risks aspiration and is pointless since the cause is not constipation. Small animals carry anesthesia risk, so getting a diagnosis while her condition is still good keeps treatment options open.

IssuesThe owner assumed pregnancy despite an all-female group and left it for a week. They did not know that one-sided swelling differs from the symmetrical swelling of pregnancy. The signs of pain (hunching, resisting touch, fast breathing) were not understood.

ImprovementKnow the sex composition of the group and always be aware of whether pregnancy is possible. Add left-right asymmetry of the abdomen to the observation checklist, and see a vet for any swelling lasting 2–3 days or more. Learn the signs of pain and understand that an early diagnosis widens treatment options for small animals.

A male pygmy mouse just past 3 years old. Over the past two weeks he has come to the feeding spot less often and his coat has become unkempt. He no longer uses the wheel and mostly stays still in the nest. His weight has dropped from 6 g to 5 g. He is drinking water. There are no visible injuries or lumps.

Which is the most appropriate first action?

1. It is old age, so do nothing and quietly watch over him
2. Give human supplements for nutrition
3. Move him to a group with young animals for stimulation
4. See a vet with weight records and diet details, check for pain or disease, and adjust diet and environment

AnswerD. See a vet with weight records and diet details, check for pain or disease, and adjust diet and environment

ExplanationWith a lifespan of 1.5–3 years, 3 is old for a pygmy mouse, but reduced appetite and weight loss often hide treatable or manageable conditions such as dental problems, tumors or kidney disease. See a vet to find the cause, then adjust the environment with soft food, low hides and temperature control. Doing nothing leaves treatable suffering unaddressed. Human supplements are harmful in excessive doses. Moving him to a young group means being chased in rank disputes, causing injury and rapid decline in an old animal.

IssuesThe owner blamed the weight loss on age and did not consider illness. They did not know how to adapt food and environment for an elderly animal, and were unaware that palliative care is an option.

ImprovementWeigh elderly animals twice a week and check food intake daily. Prepare softened pellets or finely crushed food and lower the hide entrances. Have the vet check for pain and discuss treatment and palliative options. Also watch for changes in his standing within the group.

A February night. Your 2-year-old pygmy mouse keeps shifting position under the water bottle and crouches with its belly on the floor. The corner of the bedding that is usually damp has stayed dry for two days, with almost no urine marks. When you touch it, the underside of the belly feels tight. Its appetite has fallen.

Which is the most appropriate first action?

1. Press the belly to encourage urination
2. Make it drink lots of water to flush it out
3. Suspect difficulty urinating, keep it warm and contact a hospital that can see it even at night
4. It will pass urine by morning, so go to bed

AnswerC. Suspect difficulty urinating, keep it warm and contact a hospital that can see it even at night

ExplanationRepeated urination postures, a tight lower belly and fewer urine marks are emergency signs of a urinary blockage or bladder problem. Even in a small animal, continued inability to urinate leads to acute kidney failure or bladder rupture within hours, so contacting a hospital even at night is correct. Pressing the belly can rupture the bladder and must never be done. Large amounts of water do not clear a blockage and worsen things through aspiration or bladder distension. Sleeping until morning throws away critical time. Keep it warm during transport and report the course of symptoms and the time of the last urination.

IssuesThe everyday observation of bedding dampness was not connected to an abnormality for two days. Repeated urination postures were read as mere restlessness. No after-hours emergency hospital that sees small animals had been researched.

ImprovementWhen cleaning, check the amount, color and location of urine, and record any decrease or blood as abnormal. Remember repeated urination postures plus a tight belly as an emergency. Research several small-animal hospitals with night coverage and post the contacts beside the cage. Watch for reduced water intake in winter and give small amounts of moist vegetables.

1 a.m. You wake to a strange noise from the wheel. The right hind foot of your 1-year-old pygmy mouse was caught in the gap of a wire-type wheel, and even after it came free it is dragging the leg. The foot points in an unnatural direction, and it struggles violently when you try to touch it. Bleeding is slight.

Which is the most appropriate first action?

1. Straighten the leg and splint it with a toothpick
2. Put it back in the cage to be with its companions and take its mind off the pain
3. Do not touch it; move it to a small box, keep it dark and warm, and see a vet first thing in the morning
4. Dissolve a human painkiller in its water for pain relief

AnswerC. Do not touch it; move it to a small box, keep it dark and warm, and see a vet first thing in the morning

ExplanationIn a pygmy mouse with extremely fine bones, an abnormal foot angle and dragging most likely mean a fracture. A splint lets the bone ends damage vessels and skin during fixing, and is too small to hold correctly anyway. Do not touch; rest it in a dark box and see a vet first thing in the morning. Returned to the cage it will climb and run, worsening the injury, and may be chased by cage mates. Human painkillers are easily a lethal dose at a few grams and must never be given. If breathing difficulty or continued bleeding appears, contact an emergency (after-hours) animal hospital.

IssuesA wire-type wheel, whose structure traps the feet of small rodents, was the wrong choice. No rest box or warming supplies were prepared, and no plan existed for a fracture happening at night.

ImprovementReplace the wheel with an enclosed solid plastic one of a diameter suited to the body. Eliminate mesh floors, ladders and wire products. Keep an isolation box, towel and hot-water bottle together as a set, and share the rule 'do not touch, keep warm, vet next morning' for fractures with the family.

An April night. Three hours after adding a new male to a group of three males, you hear shrill squeaks. The newcomer is cornered, bleeding from the tail base and back, while the others take turns chasing it. The newcomer is trembling and motionless, and red blood oozes slowly from the wounds.

Which is the most appropriate first action?

1. Reach in and grab the attackers out with bare hands
2. Do not intervene; the hierarchy will settle eventually
3. Apply plenty of antiseptic to the wounds and return it to the cage
4. Move the newcomer to a separate cage with a cup, press the bleeding gently with gauze and see a vet by the next day

AnswerD. Move the newcomer to a separate cage with a cup, press the bleeding gently with gauze and see a vet by the next day

ExplanationFighting between males can be fatal, and a cornered animal can die within hours. Intervening with bare hands risks a bite from an agitated animal and a reflexive shake that drops it, so guide the injured animal into a cup and move it to a separate cage. Press the bleeding gently with clean gauze; bite wounds readily form abscesses, so see a vet by the next day. Leaving it without intervening leads to death. Heavy use of antiseptic damages skin, causes poisoning when licked, and the attacks resume if it is returned.

IssuesA mature male was added to an existing male group without a quarantine period. Knowledge of group composition (same-sex, neutered or not) and introduction methods was lacking. No safe capture tool such as a cup was ready.

ImprovementCompose groups of females or neutered animals, and introduce newcomers in a neutral cage after 2 weeks of quarantine. Provide more hides than animals so there are escape routes. Watch closely for 24 hours after introduction and separate immediately on squeaking or chasing. Keep a capture cup and tube beside the cage.

While cleaning the cage, your 8-month-old pygmy mouse was about to escape and you instinctively pinched the tip of its tail and lifted it. In that instant the tail skin slipped off, leaving several millimeters of exposed bone. The mouse fled into the bedding and the tail tip is bleeding.

Which is the most appropriate first action?

1. Slide the detached skin back on and wrap it with tape
2. Press the bleeding gently with gauze and see a vet the same day, since degloved tail skin does not regrow
3. It will heal once it dries, so just return it to the cage
4. It looks painful, so cool it with ice to stop the bleeding

AnswerB. Press the bleeding gently with gauze and see a vet the same day, since degloved tail skin does not regrow

ExplanationThe tail skin of mice slips off easily; detached skin does not regrow and the exposed part dies and becomes infected. Pressing the bleeding gently with clean gauze and seeing a vet the same day to treat the dead tissue and prevent infection is correct. Reattached skin will not take, and tape cuts off blood flow and spreads necrosis. Left alone, infection and tail necrosis can spread through the body. Cooling with ice drops an animal of a few grams into hypothermia at once, doing more harm than any hemostatic benefit.

IssuesThe owner did not know the basic rule of never grabbing or lifting by the tail. For an animal that should not be handled, no escape-prevention procedure or tools (cup, tube) were ready for cleaning.

ImprovementAlways move it by letting it enter a cup or paper tube on its own; never grab the tail or body. Move all animals to a spare lidded case before cleaning, and work in a closed room. Tell the whole family that degloved tail skin does not regrow.

After cleaning, as you replaced the lid of a ceramic hide, you heard a tiny squeal. Lifting the lid, you found your 1-year-old pygmy mouse pinched by the torso. Released at once, it walked into the nest on its own, but its breathing is faster and shallower than usual. There are no visible wounds or bleeding.

Which is the most appropriate first action?

1. It could walk, so judge it unharmed and carry on as usual
2. Press all over its body with your fingers to check for fractures
3. Soak it briefly in a warm bath to ease the pain
4. Rest it in a dark, warm small box and see a vet the same day, considering possible internal bleeding

AnswerD. Rest it in a dark, warm small box and see a vet the same day, considering possible internal bleeding

ExplanationIn an animal of a few grams, crushing of the torso causes rib fractures, lung or liver damage and internal bleeding that are invisible from outside, and it can often still walk right afterward. Fast, shallow breathing is a sign of chest injury or pain. Resting it in a dark, warm box and seeing a vet the same day is correct. Taking walking as proof of safety risks a sudden collapse hours later. Pressing all over moves fractured bones and adds crushing damage. A warm bath causes breathing difficulty and hypothermia and is dangerous.

IssuesThere was no step of checking for an animal inside before closing the lid. The owner did not know that crush injuries in small animals rarely show on the outside, and did not recognize the change in breathing as a serious sign.

ImprovementBefore closing any lid or door, always look inside and along the edge, and feel for resistance as you close. Choose hides with no lid or with lids that cannot drop quickly. After any crushing, see a vet even without visible injury, and learn the normal resting breathing rate (about 150 per minute) in advance.

Your child insisted on holding it, so you placed your 1-year-old pygmy mouse on a palm. Within seconds it leapt and fell about 70 cm onto the wooden floor. It lay still for a moment, then staggered toward a gap beside the furniture. Its head is tilted slightly.

Which is the most appropriate first action?

1. Quietly retrieve it with a paper tube or cup, rest it in a dark box and see a vet the same day
2. It seems lively, so just return it to the cage and observe
3. Put it on your hand again to check whether it is injured
4. Grab it quickly by hand and hold it tight before it escapes

AnswerA. Quietly retrieve it with a paper tube or cup, rest it in a dark box and see a vet the same day

ExplanationFor a 3–4 cm pygmy mouse, a 70 cm fall is a major accident with a high chance of head injury, fractures and internal bleeding. A head tilt is a neurological sign. If it reaches a furniture gap it cannot be retrieved, so guide it quietly into a cup or paper tube, keep it warm and quiet in a dark box, and see a vet the same day. Being able to move is no proof of safety; it can deteriorate hours later. Putting it on a hand again risks another fall, and gripping it crushes ribs and organs. Remember that this is an animal that must not be handled.

IssuesAn animal that should not be handled was placed on a hand at a child's request. The family had not been told it is a display animal. No retrieval procedure or criteria for rest and vet visits after a fall had been shared.

ImprovementExplain to the family that pygmy mice are animals to watch, and set a no-touching rule. Observe quietly in a dim room, and suggest other ways for children to engage, such as an observation diary. Move it only with a cup or tube, and make a same-day vet visit the rule after any fall.

In the morning, your 1.5-year-old pygmy mouse is hanging by one front foot from the underside of the tank's wire lid. Its claw is caught in the mesh and will not come free; it seems to have been struggling for minutes and the base of the leg is swollen. If you remove the lid it would fall onto the hard food dish where there is no bedding, more than 20 cm below.

Which is the most appropriate first action?

1. Support it from below with a hand or cup under the lid, tilt the mesh to ease the claw angle, free it and see a vet
2. Pull the lid off briskly and let it drop
3. Pull the leg to get it out of the mesh
4. Wait for it to work itself free

AnswerA. Support it from below with a hand or cup under the lid, tilt the mesh to ease the claw angle, free it and see a vet

ExplanationRemoving the lid without supporting the body causes a fall with fractures or head injury. Pulling the leg tears the claw off and fractures the toes or forelimb. Support the body from below with a cup or hand, then tilt the mesh in the direction of the claw to loosen it and free it. A leg that has hung for a long time may be swollen, dislocated or have impaired blood flow, so see a vet the same day. Waiting is dangerous because even at a few grams, prolonged hanging worsens the leg damage and exhaustion. After freeing it, rest it in a dark box.

IssuesThe wire lid's mesh could snag claws, and a climbable structure stood close to the lid. Night-time observation was lacking, so it went unnoticed until morning. The owner did not know the basic rule of supporting the body during rescue.

ImprovementReplace the lid with fine mesh (2 mm or less) or punched metal, and keep climbable structures well away from it. Keep the cage interior low so that thick bedding cushions any fall. Make 'support first, then free' the rule for rescues, and always keep a cup within reach.

At night, unaware that your pygmy mouse had escaped, you walked down a dark hallway. A tiny squeal came from under your feet, and you found your 2-year-old mouse moving by the wall. You are not sure whether you actually stepped on it, but it is dragging its hind legs and moving with its belly on the floor. No blood is visible at the mouth.

Which is the most appropriate first action?

1. It is moving fine, so just retrieve it and return it to the cage
2. Retrieve it with a paper tube, keep it warm in a dark box, suspect internal bleeding or pelvic injury and see a vet the same day
3. Move the hind legs yourself to check for fractures
4. It cannot move because of pain, so let it rest and watch if it seems fine

AnswerB. Retrieve it with a paper tube, keep it warm in a dark box, suspect internal bleeding or pelvic injury and see a vet the same day

ExplanationBeing stepped on causes crush fractures of the pelvis or spine, organ damage and internal bleeding that cannot be judged from outside in a small animal. Dragging the hind legs and moving on the belly are signs of pelvic or spinal injury; see a vet the same day. Keep it warm and quiet in a dark box, guiding it in with a paper tube. Movement is no proof of safety, and internal bleeding can cause a sudden collapse within hours. Manipulating the legs lets bone ends damage tissue and is extremely dangerous. Resting and watching only delays the vet visit.

IssuesThe escape went unnoticed and people walked around at night with the animal loose. The escape procedure (close off the room, light your footing) had not been shared with the family. There was no rule to see a vet after any stepping or crushing regardless of appearance.

ImprovementTell the family that after an escape the room is closed off and everyone shuffles with their footing lit. Put paper tubes and food on the floor and wait quietly in the dark for it to return. Make a same-day vet visit the rule after stepping or crushing even if it can move, and keep a transport box and warming supplies ready.

December. You placed an under-tank heater across the entire bottom of the case and kept the bedding thin. In the morning your 1-year-old pygmy mouse lies motionless with its belly on the floor; the belly fur is thin and the skin is red. The surface directly above the heater is hot to the touch. The other animals are gathered near the lid.

Which is the most appropriate first action?

1. Switch off the heater at once, move the case to a cool place, do not touch the burn and see a vet the same day
2. Pour ice water over the burn to cool it
3. Apply a thick layer of human burn ointment and watch
4. It is only red, so add bedding and continue

AnswerA. Switch off the heater at once, move the case to a cool place, do not touch the burn and see a vet the same day

ExplanationA heater under the whole floor leaves no escape, and thin bedding lets the surface overheat, causing low-temperature burns, dehydration and heatstroke. First cut the heat source, do not touch the burn, avoid over-warming and see a vet the same day. Ice water plunges an animal of a few grams into hypothermia and deepens the burn. Human ointment is licked off and causes poisoning, and does not match the burn severity. Even if it only looks red, the skin can die within days, and adding bedding and continuing leaves the cause in place. The others fleeing toward the lid was a clear sign of overheating.

IssuesThe heater covered the whole case with no temperature gradient, leaving the animals nowhere to escape. Thin bedding let the surface temperature rise excessively. There was no thermometer in the cage, so overheating could not be detected.

ImprovementPlace the under-tank heater under no more than half the case to create a warm side and a cool side. Use at least 5 cm of bedding and check the surface temperature above the heater with a thermometer. Use a thermostat-controlled product, and adjust the temperature based on where the animals gather (toward or away from the warm side) in daily observation.

A week ago there was a minor fight in the group and one animal got a small wound on its back; the bleeding stopped quickly so you left it. Today the wound area has swollen to the size of a red bean, feels soft to the touch, and the fur around it has fallen out. The animal is hunched and its food intake is low.

Which is the most appropriate first action?

1. Pierce the swelling with a needle and squeeze out the contents
2. It will burst on its own, so leave it
3. Suspect an abscess, isolate it in a separate cage and see a vet the same day for treatment
4. Flush antiseptic into the wound with a syringe

AnswerC. Suspect an abscess, isolate it in a separate cage and see a vet the same day for treatment

ExplanationRodent bite wounds let bacteria under the skin, and an abscess often forms after the wound closes. A soft swelling, hair loss and reduced appetite are classic abscess signs, and left alone it leads to systemic infection. Isolate it, see a vet the same day and have the vet drain and treat it. Piercing it yourself spreads pus under unclean conditions and risks a deep stab when the animal moves in pain. Flushing antiseptic damages tissue and, at a few grams, can cause poisoning through absorption. Remember that even small bite wounds warrant a vet visit.

IssuesBecause the bleeding stopped, the wound was taken lightly and the infection risk of bites was unknown. The cause of the fight (group composition, number of hides) was not reviewed. The wounded animal was returned to the group without follow-up observation.

ImprovementSee a vet for any bite wound, however small, and isolate the wounded animal until healed. Add hides beyond the number of animals and split feeding spots to reduce fighting. After witnessing a fight, check wound swelling, hair loss and appetite daily for several days. Review the group composition and separate if necessary.

Saturday morning. Your 1-year-old pygmy mouse is holding up its left front paw and walking on three legs. It was normal last night. One toe is swollen and oozing a little blood. The cage contains a paper-tube tunnel and a tree branch, and the branch has a thin split in its surface. Its appetite is fine.

Which is the most appropriate first action?

1. Remove possible causes such as the branch and see a vet the same day to have the toe examined
2. Bandage it to immobilize and watch for a week
3. Apply plenty of antiseptic to the swollen toe with a cotton swab
4. It has an appetite, so do nothing and wait until Monday

AnswerA. Remove possible causes such as the branch and see a vet the same day to have the toe examined

ExplanationA swollen, bleeding toe suggests a fracture, dislocation or laceration from a claw or toe caught in the split branch. Removing the likely cause to prevent recurrence and seeing a vet the same day to check the bone and for infection is correct. A bandage on a foot this size cuts off blood flow and worsens things when the animal chews it off. Heavy antiseptic damages tissue and gets licked off. Even with an appetite, fractures and infection progress, and waiting until Monday leads to toe necrosis or abscess. You need a small-animal hospital that is open on Saturdays.

IssuesItems in which toes could get caught, such as a split branch, were in the cage. No weekend hospital had been identified, so the visit was nearly postponed. There was little awareness that even a small injury is serious at this body size.

ImprovementInspect wooden items in the cage regularly for splits and splinters and replace damaged ones. Research in advance hospitals that see small animals on weekends and at night. Treat holding up or dragging a leg as a same-day vet visit, and make it a habit to remove the cause.

Sunday morning. One of your five pygmy mice is nowhere to be seen. A corner of the tank's wire lid is slightly lifted, and the cage sits on top of a bookshelf. The room door was left open, and the family cat is in the next room. Cables and books are scattered across the floor.

Which is the most appropriate first action?

1. Put the cat out, close the room door, set paper tubes and food on the floor, and wait in the dark and quiet
2. Move all the furniture and search everywhere at once
3. Set a glue-type mouse trap in a corner of the room
4. Let the cat in; it will find the mouse for you

AnswerA. Put the cat out, close the room door, set paper tubes and food on the floor, and wait in the dark and quiet

ExplanationA 3–4 cm mouse slips through a 2 mm gap and is hard to retrieve once under furniture or inside a wall. First remove the cat, close the room door to limit its range, and put paper tubes with food and water on the floor; in the dark and quiet, its nocturnal habits bring it out on its own. Shifting furniture all at once startles it into wall gaps and risks crushing or stepping on it. Glue traps tear off a mouse's skin and fur and are fatal. The cat is a predator and will kill it the instant it is found. Also check the floor area in case it fell from the bookshelf.

IssuesThe lifted lid went unnoticed and there was no locking fastener. The animals were kept with the room door open in a house with a cat. The floor scattered with cables and books was an environment where an escapee could be pinched, stepped on, or chew wiring.

ImprovementFasten all four corners of the lid with clips or locks and press to check after every closing. Keep the cage in a room the cat cannot enter and keep the door closed at all times. Tidy floor wiring and objects, and share the escape procedure (close off, paper tubes and food, dark and quiet) with the family. Make a morning and evening head count routine.

In the evening a noise brings you to the living room, where the family cat has pushed the cage lid aside and has a front paw inside. The four pygmy mice have burrowed into the bedding and cannot be seen. After removing the cat, one mouse emerges from the bedding with wet fur on its back and two small wounds. The other three cannot be found.

Which is the most appropriate first action?

1. The wounds are small, so wipe them and leave it at that
2. Scold the cat so it will not do it again, and do nothing else
3. Shut the cat in another room, confirm all animals are safe, and take the injured one to a vet the same day
4. Take all the animals out and check each one by handling it

AnswerC. Shut the cat in another room, confirm all animals are safe, and take the injured one to a vet the same day

ExplanationA cat's mouth and claws carry many bacteria; even a small wound becomes infected within hours and is fatal at a few grams. First isolate the cat to prevent another attack, count and check all the animals, and take any with wounds to a vet the same day. Wiping does not remove bacteria already under the skin. Scolding the cat does not stop predatory behavior; without changing the environment it will happen again. Handling every animal to check them puts a heavy strain on the heart from fear and invites escapes and falls. Gently part the bedding and check by sight.

IssuesIn a house with a cat, a cage with a lid that could be pushed aside was placed within the cat's reach. There was insufficient awareness that a predator's presence is a chronic stressor even out of sight, and that contact is fatal.

ImprovementKeep the cage in a room the cat cannot enter and keep the door closed at all times. Fix the lid with a lock or weight, and use mesh too fine for a cat's claws. Make a same-day vet visit the rule for any cat bite or scratch, however small, and make a daily head count routine.

The water bottle broke, so you put water in a small bowl 3 cm deep instead. At night one pygmy mouse is struggling in the bowl. When you lift it out it is soaked through, trembling nonstop and unable to stand. The room is 22°C and the other three are asleep in the nest. You do not know how long it was in the water.

Which is the most appropriate first action?

1. Blast it with a hair dryer on high to dry it quickly
2. Return it wet to the cage and let it dry itself
3. Blot it gently with a towel, warm it with a hot-water bottle through a towel, and see a vet if its responses are dull
4. Soak it in warm water to heat it up, then dry it

AnswerC. Blot it gently with a towel, warm it with a hot-water bottle through a towel, and see a vet if its responses are dull

ExplanationWhen a mouse of a few grams is soaked, its body temperature plummets within minutes and it dies of hypothermia and lung damage from near-drowning. Blot the water off by pressing gently with a soft towel, then warm it gently in a box with dry nesting using a hot-water bottle through a towel. If it responds poorly or breathes hard it may have inhaled water, so see a vet. A hair dryer on high causes burns and extreme stress, and soaking in warm water wets it again, strips body heat and risks drowning again. Leaving it wet leads to death from hypothermia. Deep water dishes are a drowning hazard for small rodents and must not be used.

IssuesA deep container was used as a substitute when the bottle failed. The owner did not know that a 3–4 cm mouse can drown in 3 cm of water. No spare bottle was on hand.

ImprovementAlways keep a spare bottle so a failed one can be replaced at once. If a dish is unavoidable, use a shallow lid with only a few millimeters of water and add pebbles for footing. Learn what to do when soaked (towel dry, hot-water bottle warming, watch breathing).

During the evening feeding, the moment you closed the front door of the acrylic case you heard a tiny squeal. The tail tip of your 1-year-old pygmy mouse is caught in the edge of the door. It is pulling its tail as it struggles desperately to move forward, and the skin at the pinched spot has turned white.

Which is the most appropriate first action?

1. Open the door slowly to release it, do not touch the tail, rest it in a dark box, and see a vet if swelling or discoloration appears
2. Grab the body and pull it free
3. Pull the tail out of the door
4. Return it to the cage right after release and carry on as usual

AnswerA. Open the door slowly to release it, do not touch the tail, rest it in a dark box, and see a vet if swelling or discoloration appears

ExplanationIf a trapped tail is pulled, the skin slips off and leaves the bone exposed. Open the door quietly to release the pressure, do not touch the tail, and rest it in a dark box for observation. If the whiteness of the skin does not fade, swelling appears, or the tail hangs limp and cannot move, necrosis or fracture is possible, so see a vet the same day. Grabbing the body effectively pulls the tail while it is trapped and causes degloving. Returning it to the group right after release means an agitated animal may be chased or have its wound bitten. Always check for animals at the edge when opening and closing the door.

IssuesThe edge was not checked before closing the door. The owner did not anticipate that animals cluster near the door during their active hours at night. The principle of 'never pull' in a pinching accident was unknown.

ImprovementClose doors and lids slowly and watch the edge until the moment they close. At feeding time, check the animals' positions with a light first and wait if any are near the door. Share the rule 'release without touching, rest in a dark box, vet for discoloration or swelling' with the family, and make sure everyone understands the risk of tail degloving.

You set your newly acquired pygmy mouse on the floor to let it 'free-roam', and within a second it bolted and vanished. The room is about 10 square meters with a TV stand and a sofa, and a heater's power cord runs along the wall. The window is closed but there is a gap of about 1 cm under the door.

Which is the most appropriate first action?

1. Lift the sofa and make loud noises to drive it out
2. Open the door and go search the other rooms
3. Find somewhere you can suck it out with a vacuum cleaner
4. Block the door gap with a towel, switch off the heater, put paper tubes and food on the floor, and wait in the dark and quiet

AnswerD. Block the door gap with a towel, switch off the heater, put paper tubes and food on the floor, and wait in the dark and quiet

ExplanationAt 3–4 cm long, a pygmy mouse passes through a 1 cm gap, and once in another room or inside a wall it is nearly impossible to retrieve. First block the gap under the door to limit its range, and switch off the heater, which poses electrocution and chewing hazards. Being nocturnal, it will often enter a paper tube with food on its own if the room is dark and quiet. Loud noises and lifting furniture startle it into wall gaps and risk crushing or stepping on it. Opening the door widens the search area. A vacuum cleaner causes fatal injuries. And this is an animal that should never free-roam in the first place.

IssuesAn animal meant for display-only keeping was let out to roam as if it were a hamster. Escape hazards such as the door gap and wiring were not identified beforehand. Understanding of its tiny size and agility was lacking.

ImprovementMake it the rule never to take a pygmy mouse out of the cage; provide exercise with climbing items and a wheel inside. As a precaution, seal the gap under the room door with weatherstrip and cover cables. Learn the escape procedure (close off, cut heat sources, paper tubes and food, wait in the dark).

To clean the cage, you put the pygmy mice in a paper cup and set it on the desk. One jumped over the rim of the cup, fell from the edge of the desk to the floor and ran under the bookshelf. The remaining three are still in the cup, trying to climb up the rim.

Which is the most appropriate first action?

1. Reach under the bookshelf and drag it out
2. First move the other three to a spare lidded case, then guide the fallen one into a paper tube to retrieve it and check for effects of the fall
3. Tip the bookshelf over and search the space underneath
4. Chase the escaped one and leave the others as they are

AnswerB. First move the other three to a spare lidded case, then guide the fallen one into a paper tube to retrieve it and check for effects of the fall

ExplanationTo prevent a secondary accident, first secure the remaining animals in a lidded case. For the fallen one, slide a paper tube under the bookshelf, keep things dark and quiet, and wait for it to enter on its own. Reaching in startles it deeper or crushes it with your fingers, causing fractures or tail degloving. Tipping the bookshelf would crush it. Leaving the others lets all three escape too and widens the damage. The retrieved animal may have a head injury or fractures from a fall of about 70 cm, so rest it in a dark box and see a vet the same day if it staggers or drags a leg.

IssuesAn open paper cup was used for temporary holding and placed high up on a desk. No cleaning procedure (moving to a spare lidded case) was established. The owner did not know that pygmy mice climb vertical surfaces and jump.

ImprovementWhen cleaning, always move the animals with their bedding into a spare lidded case and work on the floor. Use a transfer tube with one end closed. Work in a closed room with the gap under the door sealed. Always rest and observe a fallen animal even without visible injury.

Late at night a persistent odd noise from the cage draws you over. Part of the body of your 1.5-year-old pygmy mouse is caught between the exposed metal axle and the support of the wheel, and it is being dragged each time the wheel turns. Another animal keeps running on the wheel. The trapped animal is squealing continuously.

Which is the most appropriate first action?

1. Stop the wheel, remove the other animal, take the whole wheel out of the cage and disassemble it to free the trapped one
2. Pull the trapped animal out
3. Spin the wheel backward to free it
4. Cut the fur with scissors and pull it out

AnswerA. Stop the wheel, remove the other animal, take the whole wheel out of the cage and disassemble it to free the trapped one

ExplanationFirst stop the wheel by hand, remove the animal running on it, and take the whole wheel out of the cage. Do not pull on the trapped part; disassemble the axle or support to release the pressure. Pulling strips skin or the tail and worsens fractures. Reversing the wheel pulls it in further. Using scissors in the dark risks cutting the body. After release, keep it warm and quiet in a dark box, and contact an emergency hospital even at night because of possible internal bleeding or fractures. Replace the wheel with an enclosed type with no exposed axle to prevent a second accident.

IssuesA wheel with an exposed metal axle was in use. In a group where several animals use the wheel at once, the high risk of entanglement was not anticipated. Responding promptly to the night-time noise was good, but the owner did not know beforehand how to remove the parts.

ImprovementUse enclosed wheels with no exposed axle, and install several according to the group size. Learn how to disassemble them when you buy them. Handle pinching accidents in the order 'stop, remove, disassemble' and never pull. Keep the after-hours emergency contact and a transport box ready.

On the morning of the second day after an escape, you find and retrieve your 1-year-old pygmy mouse behind the TV. A nearby extension cord has tooth marks in its insulation, with some copper wire exposed. The mouse's mouth area is red and there is a small white patch on its lip. It moves sluggishly and is drooling.

Which is the most appropriate first action?

1. Open its mouth with your fingers to check for injuries
2. Rinse its mouth with water, feed it normally and watch
3. It is sluggish only because it is tired, so let it rest
4. Cut the power to prevent a fire, suspect electrical burns in the mouth and pulmonary edema, and see a vet the same day

AnswerD. Cut the power to prevent a fire, suspect electrical burns in the mouth and pulmonary edema, and see a vet the same day

ExplanationTooth marks reaching the copper, together with redness and a white patch around the mouth, indicate electrical burns inside the mouth. Electric shock can cause pulmonary edema (fluid in the lungs) and breathing difficulty hours later, so first cut the power to prevent a fire, rest it in a dark box and see a vet the same day. Opening the mouth with your fingers damages the burn, and the pain can cause a bite and a drop. Rinsing does not reverse tissue damage, and with a burn it cannot eat. Sluggishness and drooling are not fatigue but signs of nerve or mouth damage, and leaving it is dangerous.

IssuesThe search went on for two days in a room where the power cords were still live. There were no protective cable covers, and the owner did not know to cut heat sources and power during an escape. The delayed onset of electric-shock symptoms was not understood.

ImprovementCover the wiring around the cage and in the room, and eliminate cords running along the floor. During an escape, unplug appliances and switch off heaters before searching. If electric shock is suspected, see a vet the same day even without visible injury and watch the breathing rate until the next day.

Your child was eating a chocolate bar beside the cage, and the moment the lid was opened a piece fell in. One pygmy mouse grabbed it at once and carried it to the nest; by the time you noticed, about half was eaten. The piece was about the size of a pinkie nail. The mouse is moving normally so far.

Which is the most appropriate first action?

1. Give salt water to make it vomit
2. Remove the remaining chocolate and call an animal hospital for instructions, since even a small amount can poison an animal of a few grams
3. It is a tiny amount, so ignore it and watch
4. Give milk to dilute the poison

AnswerB. Remove the remaining chocolate and call an animal hospital for instructions, since even a small amount can poison an animal of a few grams

ExplanationThe theobromine in chocolate is harmful not only to dogs but to rodents, and for a pygmy mouse weighing a few grams even a pinkie-nail-sized piece is a relatively large dose. Remove the rest, report the amount and time eaten, and follow the hospital's instructions. Rodents cannot vomit, so salt water is useless and causes salt poisoning. Judging it a small amount and leaving it can lead to agitation, tremors and arrhythmia hours later. Milk causes indigestion and does nothing to dilute the toxin. Even without symptoms, confirm with a vet whether a visit is needed.

IssuesHuman food was eaten near the cage while work was done with the lid open. The owner did not understand that an amount harmless to a person is a toxic dose for such a tiny body. The basic fact that rodents cannot vomit was unknown.

ImprovementBan eating and drinking near the cage, and check that hands and surroundings are free of food before opening the lid. Share the list of forbidden foods (chocolate, onions and leeks, avocado, sweets) with the family. For accidental ingestion, set a procedure to record what, how much and when, and phone the hospital immediately.

A week ago you added cotton-type small-animal nesting because it looked cute. Now your 1-year-old pygmy mouse has a distended belly and has eaten almost nothing for two days. Its droppings are tiny and few. Another animal has cotton fibers wound around a hind leg, and the foot is swollen and purple. Large amounts of cotton have been carried into the nest, and the bag of nesting is nearly empty.

Which is the most appropriate first action?

1. Remove all the cotton, leave the leg fibers alone without pulling, and take both animals, including the one with the distended belly, to a vet the same day
2. Massage the belly to get the cotton out
3. Give olive oil to slide the cotton through
4. Pull the fibers off the leg, and wait for the bellied animal to pass stool

AnswerA. Remove all the cotton, leave the leg fibers alone without pulling, and take both animals, including the one with the distended belly, to a vet the same day

ExplanationCotton-type nesting gets swallowed during nest building and causes intestinal blockage, and its fibers wrap around legs and tails, cutting off blood flow and causing necrosis. A distended belly and reduced droppings suggest a blockage, which becomes fatal within days in a mouse that cannot vomit, so see a vet the same day. Fibers around a leg are usually tight and embedded, and pulling them tears the skin, so have the vet cut them. Massage damages the gut, and forcing oil causes aspiration and worsens the blockage. Waiting for stool is life-threatening.

IssuesCotton-type nesting, dangerous to small rodents, was chosen for its looks. The habit of carrying and swallowing nesting material was unknown. The distended belly and reduced droppings were not caught early in daily observation.

ImprovementUse only tissue, hay and paper bedding for nesting; never add cotton, yarn or fabric scraps. In daily checks, note the number and size of droppings and the shape of the belly. If you find anything wound around a foot or tail, see a vet without pulling. Check the safety for small rodents before adding any new product.

A July night. Because of the mosquitoes, you sprayed an aerosol insecticide near the window of the room where the cage is. An hour later, the three pygmy mice in the cage are running around restlessly; one is staggering with trembling legs and another is drooling.

Which is the most appropriate first action?

1. Open the window to ventilate and watch until morning
2. Wash their bodies with water to remove the chemical
3. The staggering is from the heat, so cool them with ice packs
4. Move the cage to another ventilated room, replace the bedding and contact an emergency (after-hours) animal hospital

AnswerD. Move the cage to another ventilated room, replace the bedding and contact an emergency (after-hours) animal hospital

ExplanationInsecticide ingredients are extremely toxic to small rodents weighing a few grams, and even trace amounts in the air cause neurological signs such as tremors, staggering and drooling. First move the cage to a room free of the chemical, replace the contaminated bedding, and since symptoms are present, contact an emergency hospital even at night. Ventilation alone cannot remove what is already in the body, and waiting until morning lets symptoms progress. Washing causes hypothermia and, with neurological signs, a risk of drowning. Mistaking it for heat and cooling misreads the cause and adds hypothermia.

IssuesInsecticide was sprayed in the cage room without knowing its effect on small animals. No safe summer insect measures (screens, fine-mesh lid) were in place. Knowledge to recognize staggering and drooling as poisoning signs was lacking.

ImprovementNever use insecticides, foggers or air fresheners in the room with the cage. Control insects with screens, a fine-mesh lid and physical traps. If you must use them in another room, move the cage out and ventilate thoroughly before returning it. Learn tremors, drooling and staggering as signs of poisoning.

Three days after an escape, you retrieve your 1-year-old pygmy mouse from a corner of the storage room. A nearby bag of rodenticide has been chewed open and its contents are scattered. The mouse can move, but its gums are pale and there is dried blood at the tip of its nose. Its droppings contain something blackish.

Which is the most appropriate first action?

1. Note the rodenticide's product name and active ingredient, report the bleeding tendency, and see a vet even at night
2. The bleeding has stopped, so keep it warm and see a vet the next day
3. Give human vitamin tablets and treat it at home
4. Give lots of milk and water and wait for it to pass

AnswerA. Note the rodenticide's product name and active ingredient, report the bleeding tendency, and see a vet even at night

ExplanationMost rodenticides contain anticoagulants, and signs of bleeding such as internal bleeding, nosebleeds and black stool appear days after ingestion. Pale gums are a sign of anemia, which becomes fatal quickly at a few grams. Note the product name, ingredient and time found, and see a vet even at night for antidote treatment. Even if visible bleeding has stopped, it continues inside, so postponing to the next day is dangerous. Human vitamin tablets are wrong in ingredient and dose; a vet's prescription is needed. Milk and large amounts of water do not clear the poison and risk aspiration.

IssuesThe animal escaped in a house where rodenticide was present and was not recovered for three days. The owner did not know to first remove rodenticide and glue traps during a search. The delayed bleeding tendency typical of rodenticides was not understood.

ImprovementKeep no rodenticide or glue traps in a home with pet mice. During an escape, first put away hazards throughout the house (rodenticide, medicines, detergents). If rodenticide ingestion is suspected, bring the package and see a vet even without symptoms. Learn nosebleeds, gum color and black stool as bleeding signs to watch for.

A family member put leftover raw vegetables from a dinner side dish into the cage. Thin slices of onion were mixed in, and the next morning two of the four mice are lying limp in the nest and the urine marks are reddish-brown. The remaining vegetables lie wilted on the bedding.

Which is the most appropriate first action?

1. Remove all the vegetables, suspect anemia from onion poisoning and take all the animals to a vet the same day
2. The red urine is just the color of the vegetables, so there is nothing to worry about
3. Take only the two limp animals to a vet and watch the other two
4. Make them drink lots of water to dilute the red urine

AnswerA. Remove all the vegetables, suspect anemia from onion poisoning and take all the animals to a vet the same day

ExplanationCompounds in onions and related plants destroy red blood cells and cause hemolytic anemia. Reddish-brown urine is a sign of destroyed red cells being excreted, and limpness is a symptom of anemia. At a few grams, even a small amount causes severe illness, so remove all the vegetables and take every animal to a vet the same day, since the symptom-free ones may also have eaten some. Assuming it is vegetable color is dangerous given that onion was eaten. Symptom-free animals can develop signs days later, so watching is inappropriate. Large amounts of water do not stop hemolysis and risk aspiration.

IssuesA family member put leftover human food into the cage without knowing which foods are forbidden. No one person was in charge of feeding, and there was no system for checking what was given. Red urine was not recognized as abnormal.

ImprovementAssign one person to feeding and post a list of allowed foods on the cage. Never give leftovers from human meals; give washed single vegetables in small amounts. Check urine color and stool every morning, and see a vet for reddish-brown urine. When poisoning is suspected, every animal that may have eaten it goes to the vet.

Midnight in January. Heavy snow has caused a power outage, stopping the air conditioner and under-tank heater. Outside it is below freezing, and the room has dropped to 18°C in an hour. The five pygmy mice in the glass tank are huddled in the nest, and one outside the nest is moving sluggishly. There is no word on when power will return.

Which is the most appropriate first action?

1. Put disposable hand warmers directly inside the tank
2. Set the tank beside the flame of the gas stove
3. Put all the animals in your pocket and warm them with body heat
4. Cover the tank with a blanket, hold a towel-wrapped hot-water bottle against the outside, and monitor with a thermometer

AnswerD. Cover the tank with a blanket, hold a towel-wrapped hot-water bottle against the outside, and monitor with a thermometer

ExplanationDuring an outage, cover the tank with a blanket to prevent heat loss, hold a towel-wrapped hot-water bottle against the outside, monitor with a thermometer and keep it around 24°C. Hand warmers inside cause burns on direct contact and get chewed open and eaten. Beside a flame there are carbon monoxide and overheating risks, and a gas stove heats an enclosed space like a tank very rapidly. A pocket risks crushing, escape and sudden warming from the temperature difference, and is severely stressful for an animal that must not be handled. Place the sluggish animal near the nest to warm up with the others, and see a vet after power returns if it does not respond.

IssuesNo warming supplies for a winter outage (hot-water bottle, blanket, thermometer) were on hand. Heating depended entirely on electricity with no backup. The poor insulation of a room that drops 6°C within an hour of the heating stopping is also a problem.

ImprovementKeep a hot-water bottle, blanket, battery thermometer and insulated foam box as emergency supplies. Place the tank away from exterior walls and windows, on a stand that blocks cold from the floor. Share the outage procedure (cover, warm from outside, monitor temperature) with the family and practice it once a year.

August. The air conditioner has failed, and the room is 33°C when you get home in the evening. The sides of the glass tank are hot to the touch, and the three pygmy mice are stretched out flat on the bedding, breathing fast with their mouths open. There is still water in the bottle. One responds poorly.

Which is the most appropriate first action?

1. Move the tank to a cool room, hold towel-wrapped ice packs against the outside to cool it gradually, and take the poorly responsive animal to a vet
2. Stand the tank in a container of ice water
3. Mist the animals with water and aim a fan directly at them
4. Put the whole tank in the refrigerator

AnswerA. Move the tank to a cool room, hold towel-wrapped ice packs against the outside to cool it gradually, and take the poorly responsive animal to a vet

ExplanationLying stretched out and open-mouth breathing are signs of heatstroke, which kills an animal of a few grams within a short time. First move to a cool room and hold ice packs wrapped in a towel against the outside of the tank, cooling gradually rather than suddenly. The poorly responsive animal may have dehydration or organ damage, so see a vet the same day. Ice water or a refrigerator constricts the blood vessels with sudden cooling, and small animals die of shock or hypothermia. Misting plus a direct fan strips body heat abruptly when wet and causes great stress.

IssuesThere was no backup for an air-conditioner failure and no way to monitor room temperature while away. The tendency of glass tanks to trap heat was not considered, and the sun exposure of the location was not checked. Understanding of early heatstroke signs was lacking.

ImprovementIn summer, use a thermometer you can check remotely and timer-controlled cooling, and keep ice packs frozen at all times. Place the tank on the north side out of direct sun, with heat-dissipating items such as ceramic hides. Learn open-mouth breathing and lying stretched out flat as heatstroke signs, and make a same-day vet visit the rule.

At night, a strong earthquake (JMA intensity 6) knocked the tank off the top of the bookshelf and shattered it, scattering bedding and glass. Two of the four pygmy mice are moving in the bedding; the others cannot be seen. Aftershocks continue, the power is out and the room is dark. The family is preparing to evacuate.

Which is the most appropriate first action?

1. Light your footing with a flashlight, move the animals you find into a lidded container with a paper tube, and set out paper tubes and food for the rest to retrieve before and after evacuating
2. Feel through the broken glass by hand to gather all the animals
3. There is no time to search, so leave the animals you found and evacuate
4. Stay out of the room and leave them until the aftershocks stop

AnswerA. Light your footing with a flashlight, move the animals you find into a lidded container with a paper tube, and set out paper tubes and food for the rest to retrieve before and after evacuating

ExplanationFirst check your footing with a flashlight to avoid stepping on animals and injuries from glass. Guide the animals you find into a lidded container with a paper tube, set paper tubes and food on the floor for the missing ones, and retrieve them once safety is secured. Feeling through glass by hand injures you and crushes the animals. Leaving them and evacuating very likely means death from escape, predation or hypothermia, and so does abandoning them. One advantage of this animal is that it can be carried out in a small container; bring a warming towel, food and water too.

IssuesA glass tank was placed high on a bookshelf without being secured. There was no evacuation carrier, paper tubes or stored food, and no light for a power outage. The family had not agreed on a retrieval procedure for earthquakes.

ImprovementPlace the cage on a low, stable stand with non-slip pads and earthquake anchoring. Consider a shatter-resistant acrylic case. Pack a small lidded container, paper tubes, food, a warming towel and a flashlight in the evacuation bag and keep it near the cage. Share the procedure 'light, retrieve with a tube, move to a container' with the family.

June. While rearranging the room you moved the cage directly under the air conditioner's outlet. A week later, three of the five pygmy mice are sneezing repeatedly and will not leave the nest. The cage thermometer reads 22°C in the daytime and 19°C at night when the cooling runs harder. The bedding is dry and crumbly.

Which is the most appropriate first action?

1. Turn off the cooling and open the window; that will cure it
2. The sneezing is from dust, so remove all the bedding
3. Drape a cloth over the cage to block the draft and leave it where it is
4. Move the cage out of the draft, keep it at 24–28°C, and see a vet the same day if symptoms persist

AnswerD. Move the cage out of the draft, keep it at 24–28°C, and see a vet the same day if symptoms persist

ExplanationA direct cooling draft strips body heat from a mouse of a few grams, and dry air damages the airway lining and opens the door to infection. 19°C is in the hypothermia danger zone, and sneezing plus staying in the nest are the start of respiratory symptoms. Move the cage out of the draft and restore the proper 24–28°C. If symptoms persist, see a vet the same day. Turning off the cooling in summer instead causes heatstroke. Removing all the bedding takes away their means of burrowing to stay warm. A cloth does not stop cold air entering from below, and worsens humidity and ventilation.

IssuesWhen moving the cage, the effect of the air conditioner's airflow and temperature was not considered. The thermometer reading below the proper range went unaddressed. Sneezing was not recognized as an early sign of disease.

ImprovementPlace the cage against a wall away from outlets, windows and direct sun, and check the thermometer for several days after any move. Know the proper temperature (24–28°C) and humidity (40–60%) ranges, and add an under-tank heater if it falls below the minimum. On sneezing, nasal discharge or staying in the nest, review the environment and see a vet if it does not improve.

Late June. Water droplets have formed on the inside of the glass tank's lid, the bottom of the bedding is damp and smells moldy, and the hygrometer reads over 80%. Of the four pygmy mice, one has damp, clumped fur and red skin on its belly. The pellets in the food dish have also gone damp and soft.

Which is the most appropriate first action?

1. Run a dehumidifier on maximum and drop it to 30% at once
2. Replace all bedding and food, bring the humidity back to 40–60% with dehumidifying and ventilation, and take the animal with red skin to a vet
3. Spray anti-mold spray inside the cage
4. Take the lid off, leave it open and wait for it to dry

AnswerB. Replace all bedding and food, bring the humidity back to 40–60% with dehumidifying and ventilation, and take the animal with red skin to a vet

ExplanationIn a humid tank, mold and bacteria multiply and bedding and food spoil, causing skin inflammation, diarrhea and respiratory disease. Replace all the moldy bedding and damp food, and bring the humidity back to 40–60% with dehumidifying and ventilation. The animal with red skin may have dermatitis or a fungal infection, so see a vet. Sudden dehumidifying damages the airways through dryness and dehydrates small animals. Anti-mold spray leaves chemicals on the body that cause poisoning when licked. Removing the lid invites escapes and does nothing to fix the humidity.

IssuesThe poor ventilation of a glass tank and its tendency to trap moisture were not considered. Humidity control and bedding changes in the rainy season were insufficient. The spoiled food went unnoticed and was kept in use.

ImprovementIn the rainy season, watch the hygrometer, use a dehumidifier or a well-ventilated lid, and change bedding at least weekly. Store pellets in a sealed container and discard any that get damp. Add lid condensation, damp bedding bottoms and moldy smells to your inspection list, and see a vet promptly for red skin or hair loss.

Your elementary-school child helped clean the cage, cleared the bedding and droppings with bare hands, and then ate a snack without washing up. Two days later the child has a fever, stomach pain and diarrhea. The mice show no particular symptoms, though one has softer stool than usual. The child says they always worked bare-handed when cleaning.

Which is the most appropriate first action?

1. Take the child to a pediatrician and mention that they care for mice; from now on insist on gloves and hand-washing
2. The child's symptoms are a cold and unrelated
3. Getting rid of all the mice will solve it
4. Give the mice human antibiotics to eliminate the source of infection

AnswerA. Take the child to a pediatrician and mention that they care for mice; from now on insist on gloves and hand-washing

ExplanationRodent droppings can contain bacteria such as Salmonella that infect people, and symptom-free animals can still carry them. Eating without washing hands leads to oral infection. Taking the child to a pediatrician and telling the doctor about the small pets leads to proper testing and treatment. Assuming a cold delays diagnosis. Getting rid of the animals is unnecessary; hygiene prevents it. Human antibiotics given to mice are the wrong dose, cause poisoning and upset the gut flora. The mouse with soft stool should have a fecal test at an animal hospital.

IssuesThe child was allowed to handle droppings bare-handed and was not taught hand-washing. The owner lacked knowledge of rodent zoonoses (Salmonella, Leptospira and others) and did not realize that eating after cleaning is dangerous.

ImprovementMake it a family rule to wear gloves for cleaning and wash hands with soap for at least 30 seconds afterward. Wash cage items in a dedicated place, not the kitchen. An adult supervises when a child does the care, and no one eats or drinks until it is finished. Have soft-stool animals tested.

You bought two young female pygmy mice at a pet shop and have just arrived home. Your existing group of three females is settled in its tank. The shop told you, 'They are group animals, so it is better to put them together soon.' The newcomers have glossy coats and look lively.

Which is the most appropriate first action?

1. Add them to the existing group today to reduce stress
2. Put a divider in the tank, let them get used to the shared space for a day, then combine
3. Put the newcomers in the tank for just a few minutes to see the reaction
4. Quarantine them in a separate cage for 2 weeks, observe stool, skin and appetite, then introduce them in a neutral new cage

AnswerD. Quarantine them in a separate cage for 2 weeks, observe stool, skin and appetite, then introduce them in a neutral new cage

ExplanationEven animals that look healthy may be carrying mites, ringworm, intestinal parasites or latent respiratory infections from the shop. Quarantine them in a separate cage for 2 weeks, observe stool, skin, appetite and breathing sounds, see a vet if anything is abnormal, and only then introduce them. Do the introduction in a neutral new cage without existing territorial scent, with more hides than animals. Same-day introduction risks both spreading infection and territorial fighting. A divider alone does not prevent airborne infection or transmission via bedding. A few minutes' trial only provokes fighting and tells you nothing about infection.

IssuesThe shop's advice was taken at face value and the need for a quarantine period was unknown. No spare cage for isolation was ready. There was insufficient awareness that healthy-looking animals can still bring in disease.

ImprovementBefore bringing new animals home, prepare a quarantine cage, bottle and hides. During the 2-week quarantine, care for the existing group first and the newcomers second, washing hands in between. Have a health check and fecal test done at an animal hospital during quarantine. Introduce in a neutral cage on a weekend evening when you can watch.

The family member who cleans the cage has developed an itchy, ring-shaped rash 2 cm across with a raised red edge on their arm. Around the same time, one pygmy mouse in the group was found with a circular bald patch and flaky skin on its back. The other animals' skin looks normal for now.

Which is the most appropriate first action?

1. The person sees a dermatologist and the mouse sees a vet; isolate the animal with hair loss and disinfect the equipment
2. The person applies anti-itch cream and the mouse is left to heal on its own
3. Apply human athlete's-foot cream to the mouse's bald patch
4. Giving up the mice will cure the person's rash, so look for someone to take them

AnswerA. The person sees a dermatologist and the mouse sees a vet; isolate the animal with hair loss and disinfect the equipment

ExplanationA ring-shaped rash combined with circular hair loss and flaky skin in an animal is classic dermatophytosis (ringworm, a fungal skin disease) that spreads between people and animals. The person gets tested and treated by a dermatologist and the mouse by a vet; isolate the animal with hair loss and disinfect the cage and equipment. Human anti-itch cream does not cure the fungus and leaves the animal source untreated. Human athlete's-foot cream poisons a mouse of a few grams when licked. Giving up the animals still leaves the person needing treatment and only spreads the infection to another household. Care for the isolated animal with gloves, and do it last.

IssuesThere was no knowledge linking the animal's hair loss to the person's rash. The person cleaning worked bare-handed without precautions against animal-borne skin disease. No vet visit or isolation happened when the hair loss was found.

ImprovementOn finding hair loss, flaky skin or scabs, handle with gloves and see a vet the same day. Wear gloves for cleaning and wash hands afterward. If you develop a skin problem, tell your doctor you keep animals. Wash the cage, hides and bottle regularly, and disinfect them every time during treatment.

Your child caught a small wild mouse in the garden and says, 'It looks like the pygmy mice, so I want to keep them together.' The wild animal is wet and dirty and is leaving droppings in the case. The child has already touched it bare-handed and is about to eat a snack with the same hands.

Which is the most appropriate first action?

1. They look alike, so put it in the same cage and see
2. Have the child wash their hands, do not touch the wild animal, return it promptly to where it was caught, and keep it away from the pygmy mice
3. Keep the wild animal in a separate cage and combine them once it settles
4. Wash and dry it, then keep them together

AnswerB. Have the child wash their hands, do not touch the wild animal, return it promptly to where it was caught, and keep it away from the pygmy mice

ExplanationWild rodents can carry hantavirus, Leptospira, Salmonella, mites and more, and are dangerous to both people and pygmy mice. First have the child wash with soap, do not touch the wild animal, and return it promptly to where it was caught. Keeping wildlife without a permit is also a problem under the Wildlife Protection and Hunting Management Act. Housing them together is fatal through infection and fighting, and even a separate cage in the same room leaves infection risk via air and equipment. Washing gives the wild animal hypothermia and does not remove pathogens. Wash the soiled case wearing gloves.

IssuesThe family did not know the pathogen risks of wild animals or the legal rules on keeping wildlife. Basic hygiene, such as not touching wild animals bare-handed and not eating before washing, had not been shared.

ImprovementMake 'do not touch or bring home wild animals' a family rule and explain the reasons to the child. Build the habit of always washing hands after touching any animal. Bring no other animals into the pygmy mice's room, and when handling wild-animal droppings, wear gloves and dampen them before cleaning.

In the morning, your 2-year-old pygmy mouse is lying on its side in the nest. Its eyes are half-open and its body is slightly cold. The others are active some distance away. You cannot tell whether it is breathing; it is too small to see the chest move. The room is 21°C, and the heating was off overnight. It ate normally until last night.

Which is the most appropriate first action?

1. Press hard on the chest with your fingers and start cardiac massage
2. Put your mouth to its nose and blow air in
3. Rest a finger lightly on its back to feel for breathing, poke it to check for a response, and if there is any at all, keep it warm and go to a vet immediately
4. It is not moving, so declare it dead and prepare for burial

AnswerC. Rest a finger lightly on its back to feel for breathing, poke it to check for a response, and if there is any at all, keep it warm and go to a vet immediately

ExplanationA pygmy mouse breathes fast, about 150 times a minute, and a finger rested lightly on the back can feel the movement. Check for a slight movement when poked or any sign of breath at the mouth; if there is any response at all, hypothermia is likely, so warm it with a hot-water bottle through a towel and go to a vet immediately. At a few grams, chest compressions cause fractures and organ damage and are not done. Blowing human breath in ruptures the lungs. Hypothermia can mimic death, and a hasty declaration throws away a life that could be saved. If there is no response after 30 minutes of warming, have the hospital confirm.

IssuesThe animal chilled in a room at 21°C, below the proper range, and went unnoticed until morning. The owner did not know how to check breathing and response, risking a false declaration of death. It was not understood that CPR is unsuitable for small animals.

ImprovementPractice checking breathing from the rise and fall of the back in normal times, and learn the normal rate. Keep the room at 24°C or above with an under-tank heater for a gradient. Make 'if unsure of the response, warm first and go to the hospital' the rule, and keep a transport box and hot-water bottle where they can be used at once.

During cleaning, your 1-year-old pygmy mouse fell from a cup to the floor 1 m below. When you pick it up the body is limp, the mouth is open and you can see bedding dust inside. A finger on its back feels no breathing movement. It is 11 p.m., and the family is panicking and about to press on its chest.

Which is the most appropriate first action?

1. Extend the neck, clear the bedding from the mouth with a cotton swab, keep it warm, call an emergency (after-hours) animal hospital and transport it immediately
2. Do chest compressions for a minute and then head to the hospital
3. Shake it hard to stimulate it back to consciousness
4. Dip the body in water to wake it up

AnswerA. Extend the neck, clear the bedding from the mouth with a cotton swab, keep it warm, call an emergency (after-hours) animal hospital and transport it immediately

ExplanationIn a pygmy mouse of a few grams, chest compressions cause rib fractures and organ damage and are not a realistic resuscitation measure. What you can do is secure the airway: extend the neck, remove bedding and foam from the mouth with a cotton swab, warm it with a hot-water bottle through a towel, call an emergency hospital with oxygen and transport immediately. Shaking further damages a head and spine already injured by the fall. Dipping in water causes hypothermia and aspiration. Keep warming from outside the box during transport, dark and quiet. Even faint breathing can return, so do not give up; head for the hospital.

IssuesDuring cleaning, the cup was handled at a height of 1 m without a lid. The limits of CPR in small animals and the alternatives of airway clearance, warming and oxygen were unknown. The after-hours emergency contact had not been researched.

ImprovementClean while sitting on the floor and move animals in a lidded container kept low. Share the procedure 'airway, warmth, immediate transport' with the family, and keep cotton swabs and a hot-water bottle with the cleaning supplies. Post the contact for an after-hours hospital that sees small animals beside the cage and save it in your phone.

In the middle of the night there was a fight in the group, and the tip of one pygmy mouse's tail has been bitten off and is bleeding. Drops of blood are spreading across the bedding, and the animal runs around and stops repeatedly. You moved it to a separate cage, but after several minutes blood is still oozing. It weighs about 6 g.

Which is the most appropriate first action?

1. Tie a thread around the base of the tail to stop the bleeding
2. Press the site gently with clean gauze, hold still for a few minutes, and if it does not stop, transport it with the gauze in place
3. Press flour into the wound
4. The blood loss is small, so leave it and wait for morning

AnswerB. Press the site gently with clean gauze, hold still for a few minutes, and if it does not stop, transport it with the gauze in place

ExplanationA 6 g mouse has a tiny total blood volume, and even a few drops affect its whole condition. The basic step is to press the site gently with clean gauze and hold still for a few minutes. If it does not stop, put it in a dark box with the gauze in place, keep it warm and transport it to an emergency hospital. Tying the base of the tail cuts off blood flow and the whole tail dies. Flour pushes foreign matter into the wound and causes infection. Leaving it risks blood loss and infection, and bite wounds readily form abscesses, so see a vet by the next day. Running around raises blood pressure and increases bleeding, so keep it dark and quiet.

IssuesA group composition prone to fighting was kept without night-time supervision. There was no clean gauze or knowledge of stopping bleeding, with the risk of a panicked, mistaken response. The seriousness of blood loss in a small animal was not understood.

ImprovementReview the causes of fighting (mixed males, too few hides, overcrowding) and split the group if needed. Stock the first-aid kit with clean gauze, cotton swabs, a small box and a hot-water bottle. For bleeding, learn 'press gently, hold still, dark and warm, transport if it does not stop', and see a vet for bite wounds by the next day.

A December evening. Your limp 1-year-old pygmy mouse needs to go to the vet. The hospital is 30 minutes away by car and it is 5°C outside. At home you have a small plastic box, tissues, a hot-water bottle and a dog carrier. The animal is cold to the touch and moving sluggishly.

Which is the most appropriate first action?

1. Put it in the dog carrier with its bedding and drive with the window open for ventilation
2. Hold it in your hand and carry it in a breast pocket
3. Line a small box with air holes with tissue, hold a towel-wrapped hot-water bottle against the outside, darken it and carry it on your lap
4. Put the hot-water bottle directly inside the box and seal it

AnswerC. Line a small box with air holes with tissue, hold a towel-wrapped hot-water bottle against the outside, darken it and carry it on your lap

ExplanationFor transport, punch air holes in a small box, line it with tissue, keep it dark and quiet, and warm it from the outside with a hot-water bottle wrapped in a towel. Hold it on your lap to dampen vibration, and keep it out of direct sun and the heater's direct blast in the car. A dog carrier lets it escape through gaps, is too big to keep warm, and an open window drives hypothermia further. Holding it by hand causes stress from pressure and the temperature difference, and it escapes from a breast pocket. A hot-water bottle inside the box causes burns, and sealing it causes suffocation. Phone the hospital ahead with the symptoms and arrival time.

IssuesNo transport container for a small animal had been prepared in advance. The owner did not know how to combine warmth and ventilation for winter transport. Phoning ahead and preparing items to bring (stool photos, weight records) were also lacking.

ImprovementKeep a transport kit of a small box with air holes, tissues, a hot-water bottle and a towel. Phone the hospital before leaving to confirm they see small animals and give your arrival time. Bring notes on weight records, photos of stool and bedding, the number of cage mates and the time of the last meal.

1 a.m. on a Saturday night. Your 1.5-year-old pygmy mouse is breathing with its mouth open and sitting with its fur puffed up. It was fine until the evening. Your regular vet is closed until Monday. The after-hours emergency hospital 40 minutes away by car answers the phone but says, 'We will check whether we can see small animals.' The room is 25°C.

Which is the most appropriate first action?

1. Keep it warm and wait for your regular vet on Monday
2. Try a folk remedy found online and watch until morning
3. Put it with animals from another group so they can warm each other
4. Open-mouth breathing is an emergency sign, so transport it as soon as the hospital confirms it can see it

AnswerD. Open-mouth breathing is an emergency sign, so transport it as soon as the hospital confirms it can see it

ExplanationRodents normally breathe through the nose, and breathing with the mouth open is an emergency sign of severe respiratory distress. The puffed-up posture also shows suffering, and a sudden collapse is possible within hours. Once an emergency hospital that can see it is found, transport it at once in a warmed small box for treatment such as oxygen. Waiting until Monday carries a high risk of death. Folk remedies have no basis and waste time. Putting it with other animals spreads infection, and a weak animal gets pushed aside. If told they cannot see it, phone several emergency hospitals to find one.

IssuesNo alternative hospital had been decided for when the regular vet is closed. The seriousness of open-mouth breathing as an emergency sign was not recognized, so time was lost hesitating. The reality that few after-hours hospitals see small animals was not understood.

ImprovementResearch several hospitals with night and holiday coverage that see small animals, and post their contacts beside the cage. Share with the family the criteria: 'open-mouth breathing, no response, bleeding that will not stop, cold body' means go now; 'not eating, diarrhea, breathing sounds' means see a vet the same day. Keep the transport kit ready at all times.

In the evening, your 2-year-old pygmy mouse is lying on its side on the bedding with white foam coming from its mouth. Its limbs twitch now and then, and its breathing is shallow and fast. Today you changed to new bedding, a fine, powdery type, and there is powder around its nose too. The cage mates are burrowed into the nest and cannot be seen.

Which is the most appropriate first action?

1. Pour water into the mouth to rinse away the foam
2. Hold the body down to stop the convulsions
3. Extend the neck to secure the airway, remove the foam and powder from the mouth and nose with a cotton swab, keep it warm and go to a vet immediately
4. Switching back to the old bedding will fix it, so change it back and watch

AnswerC. Extend the neck to secure the airway, remove the foam and powder from the mouth and nose with a cotton swab, keep it warm and go to a vet immediately

ExplanationFoam at the mouth, twitching and shallow fast breathing are serious signs of airway obstruction, aspiration, poisoning or seizures. First extend the neck gently to secure the airway, gently remove the foam and powder from the mouth and nose with a cotton swab, warm it with a hot-water bottle through a towel and go to a vet immediately. Pouring water into the mouth causes aspiration into the lungs and worsens the breathing difficulty. Holding it down during a seizure causes fractures and the stimulation intensifies the seizure; moving it to a dark, quiet box is correct. Changing the bedding and watching wastes time when serious symptoms are already present. Fine powdery bedding can be inhaled and block the airway, and must not be used.

IssuesFine powdery bedding was used without knowing the inhalation risk for small rodents. The basic measures of airway clearance and warming on seeing serious signs (foam, convulsions, lying on the side) were not known.

ImprovementUse low-dust paper or aspen bedding and trial any new product in small amounts. Stock the first-aid kit with cotton swabs, gauze, a small box and a hot-water bottle. Learn the procedure 'airway, dark and quiet warming, immediate vet visit', and agree as a family that during a seizure you move it to a box without touching it.