What is most often fed wrongly to hamsters, gerbils, rats and mice?

Omnivorous pelleted feed as the staple, a moderate amount of vegetables and fruit, and avoidance of high-fat treats that cause obesity and cheek pouch impaction. Common feeding mistakes: too many sunflower-seed-type treats, and soft wet food packed into the cheek pouch and not cleared, leading to fermentation and infection. ｜ Omnivorous pelleted feed, a moderate amount of seeds, vegetables and fruit; they naturally hoard food. Common feeding mistakes: too many high-fat treats. ｜ Omnivorous pelleted feed, a moderate amount of fresh vegetables and fruit, with obesity to be guarded against. Common feeding mistakes: human food high in sugar and salt, and overfeeding. ｜ As for rats but in smaller portions. Common feeding mistakes: misjudging portion size, leading to obesity or an unbalanced diet.

What signs in hamsters, gerbils, rats and mice mean going to the vet immediately?

Acute watery diarrhoea with dehydration; a torpid state from which the animal cannot be roused (normal hibernation-like torpor must be excluded first). ｜ Persistent seizures that do not settle; traumatic degloving of the tail (never grasp the tail tip). ｜ Severe respiratory distress; a ruptured, bleeding tumour. ｜ Severe traumatic fighting wounds; respiratory distress.

What is the most common disease in hamsters, gerbils, rats and mice?

1. Wet tail (proliferative ileitis): bacterial, precipitated by stress, with young hamsters at high risk → acute watery diarrhoea, dehydration, lethargy, deteriorating very rapidly with high mortality. Merck verbatim: 「Proliferative ileitis is the most consequential intestinal disease of 3- to 10-week-old Syrian hamsters and results in high mortality rates」 , verified 2026-07-30. → what may be cited is "Syrian hamsters aged 3–10 weeks, high mortality", not any figure in hours or days. ⚠️ The practical meaning for keepers is unchanged and more honest: do not wait out any number of hours — acute watery diarrhoea is an emergency in itself*→ physical examination/faecal testing → emergency supportive care plus antibiotics (prescription) → reduce weaning and transport stress. ｜ 1. Seizures: hereditary or stress-precipitated, mostly benign and self-limiting → brief rigidity/convulsion followed by spontaneous recovery → history and physical examination to exclude other causes → usually no treatment needed, but frequent episodes warrant veterinary attention → avoid excessive startling. ｜ 1. Chronic respiratory disease (mycoplasma-related): environmental ammonia/mycoplasma infection → sneezing, coarse respiratory sounds, reduced activity → auscultation/radiography → antibiotics plus environmental improvement (prescription) → keep the cage clean and ventilated. ｜ 1. Fighting injuries (an extension of barbering): social hierarchy conflict → skin bite wounds, hair loss → physical examination → wound management/isolation of the aggressor (prescription as needed) → assess social compatibility within the cage.

🏛 Part of the "vet" topic shelf →

Hamsters/gerbils/rats/mice | Husbandry and health: a 12-column knowledge tree

獸醫百科編輯部2026-08-13About 15 min read

#獸醫百科 #小型哺乳 #倉鼠／沙鼠／大鼠／小鼠 #飼養照護 #動物照護

A single table covering twelve columns for hamsters, gerbils, rats and mice (Hamster/Gerbil/Rat/Mouse): species and breeds with lifespan, normal physiological parameters, housing, nutrition, behaviour and welfare, preventive medicine, common diseases, emergency red flags, zoonoses, household toxins, geriatric and end-of-life decisions, and authoritative sources. Where the source chapter could not find an authoritative figure, the field is left blank with the reason stated, and this site does not fill in a number on its behalf. It suits taking on a new animal, or working out which direction to look in when something seems wrong.

Hamsters/gerbils/rats/mice | Husbandry and health: a 12-column knowledge tree (Hamster/Gerbil/Rat/Mouse)

This article is compiled from the 12-column knowledge tree for hamsters, gerbils, rats and mice in the small mammals chapter of the veterinary animal encyclopaedia. Small mammals differ enormously from one another — rabbits and guinea pigs have no vomiting reflex, chinchillas tolerate heat very poorly, and ferrets are carnivores — so doing what works for another species can do harm. Confirm which animal you have first.

Column	Hamster	Gerbil	Rat	Mouse
1 Species/breeds and lifespan	The Syrian (golden) hamster is solitary; some dwarf hamster strains can be kept in same-sex groups. Lifespan: sources disagree and are listed separately — Syrian (golden) hamsters 2–3 years (Merck Vet Manual: 「Syrian hamsters have a lifespan of 2–3 years.」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/hamsters>); pet hamsters generally (strain not specified) 1.5–3 years (Merck consumer page: 「Hamsters kept as pets may live from 18 months to 3 years.」<https://www.merckvetmanual.com/all-other-pets/hamsters/description-and-physical-characteristics-of-hamsters>); a UK primary-care study of age at death gives a median of 1.75 years (Syrian 1.76 years, non-Syrian/dwarf 1.68 years, with no statistically significant difference; PMC: 「The median age at death across all hamsters was 1.75 years...did not differ between Syrian (golden) (1.76 years...) and non-Syrian (golden) hamsters (1.68 years...)」<https://pmc.ncbi.nlm.nih.gov/articles/PMC9796486/>; this is actual age at death rather than the upper limit of husbandry potential, so the figure runs low. Verified 2026-07-30).	The Mongolian gerbil (Meriones unguiculatus), highly social. Lifespan: three sources give different figures and are listed separately — 2–3 years (Merck: 「The normal lifespan of a gerbil is 2–3 years.」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/gerbils>); 3–4 years (AEMV gerbil care guide: 「AVERAGE LIFE SPAN IN CAPTIVITY: 3–4 years.」<https://aemv.org/wp-content/uploads/2024/10/aemv_trifold_gerbil_web_7-31.pdf>); 3–5 years (the PMC Saunders Manual pet rodent table: <https://pmc.ncbi.nlm.nih.gov/articles/PMC7271187/>. Verified 2026-07-30).	Rattus norvegicus, domestic/laboratory strains, highly intelligent and strongly social. Lifespan: 1.5–3 years (two Merck pages agree: 「of rats, 18–36 months」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/mice-and-rats-as-pets>; 「The usual life span of rats is about 1.5 to 3 years」<https://www.merckvetmanual.com/all-other-pets/rats/description-and-physical-characteristics-of-rats>); the PMC pet rodent table separately gives 2–4 years, which differs from Merck and is listed alongside it without choosing between them (verified 2026-07-30).	Mus musculus, strongly social, though adult males may need separate cages. Lifespan: two places on the Merck site also differ slightly — 1.5–2.5 years (Merck: 「The usual life span of mice is 1.5 to 2.5 years.」<https://www.merckvetmanual.com/all-other-pets/mice/description-and-physical-characteristics-of-mice>); 1.5–2 years / 18–24 months (another Merck page: 「average lifespan of mice is 18–24 months.」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/mice-and-rats-as-pets>); the PMC pet rodent table separately gives 1–3.5 years, and all three are listed side by side without compromise (verified 2026-07-30).
2 Normal physiological parameters	Monitor body weight, coat and activity; in cold conditions a hibernation-like torpor may appear and is easily mistaken for death. Figures: conflicting sources listed side by side — body temperature: the PMC Pet Rodents table gives 36.2–37.5°C, while PMC Clinical Evaluation of Rodents gives a single value of 37.6°C; heart rate: 250–600 bpm in the former, 300–475 bpm in the latter; respiratory rate 33–155 breaths/min (given only in the Pet Rodents table; the official Merck physiological table does not cover rodents); adult body weight: Syrian hamsters 110–140 g (females heavier than males; Merck: <https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/hamsters>), dwarf hamsters <100 g (same source); the PMC Pet Rodents table separately gives males 85–110 g and females 95–120 g, and the two are inconsistent and listed together (PMC: <https://pmc.ncbi.nlm.nih.gov/articles/PMC7271187/> and <https://pmc.ncbi.nlm.nih.gov/articles/PMC7110741/>). On cold-induced torpor, Merck notes separately that Syrian hamsters often hibernate when the ambient temperature falls below 5°C (41°F) (same source, verified 2026-07-30).	Monitor body weight, activity and seizure frequency (some strains have a hereditary tendency to seizures, mostly benign). Figures: body temperature 37–39°C (Merck: 「Normal body temperature is 37–39°C [98–102°F]」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/gerbils>; two other PMC sources give 38.2°C and 38.1–38.4°C respectively, and all three are listed together); heart rate: PMC Clinical Evaluation of Rodents gives 250–600 bpm and the Pet Rodents table a single value of 360 bpm, listed together without compromise; respiratory rate 70–120 breaths/min (PMC Pet Rodents table); adult body weight three sources differ and are listed together: Merck 「females weigh 70–100 g, and males weigh 80–130 g」; the AEMV gerbil guide 「Females: 55–85 g; Males: 65–100 g」; the PMC Pet Rodents table 「males 60–110 g, females 50–80 g」 (verified 2026-07-30).	Monitor body weight, respiratory sounds (they are prone to chronic respiratory disease) and coat. Figures: conflicting sources listed side by side — body temperature: PMC Clinical Evaluation of Rodents 37.7°C, the Pet Rodents table 35.9–38.2°C; heart rate: 300–500 bpm in the former, 250–600 bpm in the latter; respiratory rate 33–127 breaths/min (Pet Rodents table); adult body weight: Merck 「adult female rats typically weigh 12 to 16 ounces (350 to 450 g), and adult male rats usually weigh 16 to 23 ounces (450 to 650 g)」<https://www.merckvetmanual.com/all-other-pets/rats/description-and-physical-characteristics-of-rats>; PMC Clinical Evaluation of Rodents separately gives males 250–500 g, and the Pet Rodents table gives males 300–520 g and females 250–300 g, all three inconsistent and listed together (verified 2026-07-30).	Monitor body weight and coat (poor grooming warrants attention). Figures: conflicting sources listed side by side — body temperature: PMC Clinical Evaluation of Rodents 37.1°C, the Pet Rodents table 35.5–38°C; heart rate: 425–700 bpm in the former, 325–780 bpm in the latter; respiratory rate 60–230 breaths/min (Pet Rodents table); adult body weight: the Merck consumer page gives 「Adult mice typically weigh about 1 ounce (28 grams)」 (sexes not separated) <https://www.merckvetmanual.com/all-other-pets/mice/description-and-physical-characteristics-of-mice>; the PMC Pet Rodents table separately gives males 38–42 g and females 30–35 g, and Clinical Evaluation of Rodents gives males 20–40 g, all three listed together without compromise (verified 2026-07-30).
3 Housing	Bedding deep enough to burrow in, avoidance of wire mesh flooring (which readily injures the feet), and single housing (Syrian hamsters housed together will fight, sometimes fatally). Parameters: the AEMV hamster care guide gives 「optimum temperatures of 65–79°F (18–26°C)...pups maintained at 71–75°F (21–24°C); relative humidity environment of 40–70%」<https://aemv.org/wp-content/uploads/2024/10/aemv_trifold_hamster_web_7-3.pdf>; the PMC Pet Rodents table separately gives 18.3–23.8°C and 30–70% humidity, slightly different and listed together. The official Merck page provides only the hibernation threshold: 「they often hibernate at temperatures <5°C (41°F)」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/hamsters> (verified 2026-07-30).	Deep bedding to burrow in, family or same-sex group housing (solitary housing is not acceptable), and avoidance of excessive humidity (they come from a dry habitat). Parameters: the humidity figures conflict directly — the AEMV gerbil guide: 「ideal temperature...65–71°F (18–21°C) with 45–55% humidity」<https://aemv.org/wp-content/uploads/2024/10/aemv_trifold_gerbil_web_7-31.pdf>; but Merck explicitly warns that high humidity causes disease: 「propensity to develop nasal dermatitis at relative humidities >50%, low humidity is advisable」「Prevention requires lowering environmental humidity below 40%.」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/gerbils> — the two conflict, no compromise is drawn, and keepers should take the more conservative (lower humidity) figure as their safety margin. The PMC Pet Rodents table separately gives 21.1°C and 30–50% humidity (verified 2026-07-30).	Enough vertical and horizontal space, multi-level cage furniture, and avoidance of wood shaving dust (which precipitates respiratory problems; paper-based bedding is recommended). Parameters: the AEMV rat care guide (see the official care guide list at aemv.org <https://aemv.org/exotic-pet-care-guides/>): 「room temperature (65–80°F [18–26°C]) with 40–70% humidity」, with a warning that 「Temperatures over 85°F (29°C)」 are unsafe; Merck (combined rat and mouse page): 「Mice and rats are optimally maintained at temperatures of 18–26°C (64–79°F)」「An acceptable range of relative humidity is 30–70%」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/mice-and-rats-as-pets>; the PMC Pet Rodents table separately gives 21.1–26.6°C and 50–70% humidity, all three slightly different and listed together (verified 2026-07-30).	As for rats but with smaller space requirements, and escape-proofing is needed (they are small and slip through gaps). Parameters: Merck (combined rat and mouse page, as above): temperature 18–26°C (64–79°F), humidity 30–70%; the PMC Pet Rodents table separately gives 21.1–29.4°C and 30–70% humidity; AEMV has no mouse-specific care guide (the official guide list at aemv.org was reviewed during verification and covers only rabbits/ferrets/gerbils/guinea pigs/hamsters/hedgehogs/chinchillas/rats/sugar gliders, but not mice), so the environmental parameters for mice can only be cited from the combined Merck rat and mouse page (verified 2026-07-30).
4 Nutrition and feeding	Omnivorous pelleted feed as the staple, a moderate amount of vegetables and fruit, and avoidance of high-fat treats that cause obesity and cheek pouch impaction. Common feeding mistakes: too many sunflower-seed-type treats, and soft wet food packed into the cheek pouch and not cleared, leading to fermentation and infection.	Omnivorous pelleted feed, a moderate amount of seeds, vegetables and fruit; they naturally hoard food. Common feeding mistakes: too many high-fat treats.	Omnivorous pelleted feed, a moderate amount of fresh vegetables and fruit, with obesity to be guarded against. Common feeding mistakes: human food high in sugar and salt, and overfeeding.	As for rats but in smaller portions. Common feeding mistakes: misjudging portion size, leading to obesity or an unbalanced diet.
5 Behaviour and welfare	Normal: nocturnal and solitary (Syrian), storing food in the cheek pouches, running on a wheel. Stress signals: over-grooming to baldness, stereotypic circling. The five welfare needs: bedding deep enough to burrow in, a quiet daytime sleeping environment, and correct judgement of solitary versus group housing according to species.	Normal: burrowing and tunnelling, group grooming, foot-thumping as an alarm. Stress signals: fur-pulling, individuals becoming isolated. The five welfare needs: never house alone; same-sex or family groups are required.	Normal: highly curious, grooming interactions, squeaking communication. Stress signals: barbering (a dominant individual chewing the fur of a subordinate). The five welfare needs: social interaction and environmental enrichment (toys/tunnels).	Normal: group activity, grooming. Stress signals: barbering, fighting injuries between adult males. The five welfare needs: appropriate social grouping (separating fighting males into different cages where necessary) and environmental enrichment.
6 Preventive medicine	Regular health checks, watching for tumours and dental problems. Frequency: an annual check-up is recommended (AEMV hamster care guide: 「It is recommended that your hamster have an annual exam.」<https://aemv.org/wp-content/uploads/2024/10/aemv_trifold_hamster_web_7-3.pdf>, verified 2026-07-30).	As at left. Frequency: an annual check-up is recommended (AEMV gerbil care guide: 「It is recommended that your gerbil have an annual exam.」<https://aemv.org/wp-content/uploads/2024/10/aemv_trifold_gerbil_web_7-31.pdf>; Merck separately mentions that a newly acquired gerbil should be examined within 48–72 hours by a veterinarian familiar with gerbils, which is not a routine frequency. Verified 2026-07-30).	Regular health checks; rats are prone to tumours and early detection matters. Frequency: an annual check-up is recommended (two independent whitelisted sources agree — AEMV: 「It is recommended that your rat have an annual exam.」; Merck: 「Rats should be examined annually by a rat-savvy veterinarian who can pick up on subtle signs of illness early.」<https://www.merckvetmanual.com/all-other-pets/rats/routine-health-care-of-rats>, verified 2026-07-30).	As at left. Frequency: 【No single authoritative figure for this item: the whitelisted sources do not provide a mouse-specific health-check frequency. The Merck routine mouse care page recommends only 「see a vet when signs of illness appear」 and gives no routine check-up frequency; AEMV has no mouse-specific care guide available. With no fixed frequency standard, the recommendation is to seek care as soon as something abnormal is noticed and to have regular examinations as advised by a veterinarian. Verified 2026-07-30】.
7 Common diseases, top 10	1. Wet tail (proliferative ileitis): bacterial, precipitated by stress, with young hamsters at high risk → acute watery diarrhoea, dehydration, lethargy, deteriorating very rapidly with high mortality. Merck verbatim: 「Proliferative ileitis is the most consequential intestinal disease of 3- to 10-week-old Syrian hamsters and results in high mortality rates」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/hamsters>, verified 2026-07-30. → what may be cited is "Syrian hamsters aged 3–10 weeks, high mortality", not any figure in hours or days. ⚠️ The practical meaning for keepers is unchanged and more honest: do not wait out any number of hours — acute watery diarrhoea is an emergency in itself → physical examination/faecal testing → emergency supportive care plus antibiotics (prescription) → reduce weaning and transport stress.<br>2. Cheek pouch impaction: soft wet food or a foreign body becoming lodged → unilateral cheek swelling, difficulty eating → physical examination → veterinary clearance (requires anaesthesia) → avoid wet, sticky food.<br>3~10: Skin tumours (melanomas are common in Syrian hamsters, with an incidence in males roughly ten times that in females, associated with the flank organ; Merck: 「Melanomas, not only of the flank organ but also of the skin, are common in Syrian hamsters」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/hamsters>; tumours in dwarf hamsters are mostly skin-related, such as mammary tumours, fibromas and papillomas, same source), and a diabetic tendency in certain strains (the Chinese hamster: pancreatic beta cells first compensate for increased demand and then fail, producing a relative or absolute insulin deficiency, with a genetic basis of at least two pairs of recessive homozygous genes; PubMed: <https://pubmed.ncbi.nlm.nih.gov/6761191/>; the Djungarian dwarf hamster: in one newly established colony 98% showed ketoacidosis at birth, of which about 10% subsequently developed persistent hyperglycaemia, with structural lesions in the pancreatic B cells; PubMed: <https://pubmed.ncbi.nlm.nih.gov/354796/>) among others (verified 2026-07-30).	1. Seizures: hereditary or stress-precipitated, mostly benign and self-limiting → brief rigidity/convulsion followed by spontaneous recovery → history and physical examination to exclude other causes → usually no treatment needed, but frequent episodes warrant veterinary attention → avoid excessive startling.<br>2. Nasal dermatitis (sore nose): facial gland secretion plus bedding friction → hair loss and redness around the nose → physical examination → topical management/change of bedding (prescription depending on the degree of infection) → choose low-dust bedding.<br>3~10: Ovarian cysts (frequent in Mongolian gerbils, with cysts 1–50 mm in diameter; Merck: 「Cystic ovaries occur frequently in Mongolian gerbils. Cysts range in diameter from 1 to 50 mm.」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/gerbils>), tumours (ovarian granulosa cell tumours account for 80% of tumours in female gerbils over 3 years old; same source: 「ovarian granulosa cell tumors in gerbil females account for 80% of tumors in animals > 3 years old」; the AEMV gerbil guide likewise lists 「Cancer/neoplasia」 among common diseases) among others (verified 2026-07-30).	1. Chronic respiratory disease (mycoplasma-related): environmental ammonia/mycoplasma infection → sneezing, coarse respiratory sounds, reduced activity → auscultation/radiography → antibiotics plus environmental improvement (prescription) → keep the cage clean and ventilated.<br>2. Mammary tumours (fibroadenoma): common in unspayed females and hormone-related → a rapidly enlarging superficial mass → palpation/cytology → surgical excision (prescription) → early neutering reduces the risk.<br>3~10: Pituitary tumours (common in older rats, causing hindlimb paresis or paralysis, with some secreting prolactin and causing spontaneous lactation; Merck: 「Pituitary gland tumors are common in older rats」...「hindlimb paresis, hindlimb paralysis」...「causing spontaneous lactation」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/mice-and-rats-as-pets>; 75% of mammary fibroadenoma cases have a concurrent pituitary tumour, same source), skin tumours (the most common subcutaneous tumour in rats is the mammary fibroadenoma, benign but prone to recurrence and occurring in both sexes; same source; the AEMV rat guide separately lists 「Cutaneous lymphoma」 and 「Mammary gland tumors」 among common diseases) among others (verified 2026-07-30).	1. Fighting injuries (an extension of barbering): social hierarchy conflict → skin bite wounds, hair loss → physical examination → wound management/isolation of the aggressor (prescription as needed) → assess social compatibility within the cage.<br>2~10: Tumours (mammary tumours are almost always malignant and often not surgically resectable; the most common skin tumours in order are mammary adenocarcinoma and fibrosarcoma; for lymphoid and haematopoietic tumours the Merck figure reads verbatim 「Neoplasia of lymphoid and hematopoietic tissues is estimated to have a prevalence of 1–2% in mice」 — that is the figure for mice, and Merck gives no percentage for rats. Merck: <https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/mice-and-rats-as-pets>), respiratory infection (the most common pathogens are Sendai virus and Mycoplasma pulmonis; same source; Filobacterium rodentium and mouse pneumonia virus are also implicated, see the Merck laboratory animal page: <https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/mice-and-rats-as-laboratory-animals>) among others (verified 2026-07-30).
8 🚨Emergency red flags	Acute watery diarrhoea with dehydration; a torpid state from which the animal cannot be roused (normal hibernation-like torpor must be excluded first).	Persistent seizures that do not settle; traumatic degloving of the tail (never grasp the tail tip).	Severe respiratory distress; a ruptured, bleeding tumour.	Severe traumatic fighting wounds; respiratory distress.
9 Zoonoses	Lymphocytic choriomeningitis virus (LCMV, shared across rodents, to be noted by pregnant women and the immunocompromised); Salmonella. The risk is similar across all four rodents.	As at left	As at left	As at left
10 Household toxins and hazards	Chocolate, caffeinated food, some indoor plants, rodenticides (also lethal to other pet rodents), tobacco products/e-cigarette liquid.	As at left	As at left	As at left
11 Geriatric care, palliative care and euthanasia decisions	Because the lifespan is short, end-stage tumours and organ failure are common. Keepers often mistakenly think "they are short-lived anyway, so it makes no difference"; the timing of euthanasia should still be decided after a veterinarian has assessed quality of life, and must not be handled by the keeper.	As at left	As at left	As at left
12 Authoritative sources	Ferrets, Rabbits, and Rodents: Clinical Medicine and Surgery (source text line 87, covering hamsters/gerbils/rats/mice and other rodents); Merck Veterinary Manual (source text line 293).	As at left	As at left	As at left

The 12 columns above are copied cell by cell from the encyclopaedia chapter, without rewriting or condensing; treatment directions state categories only, never drug names or doses, and medication requires a veterinary prescription. Where the source chapter could not find an authoritative figure (such as species-specific time thresholds for seeking care), it explicitly leaves the field blank and states why, and this site preserves that as it stands.

The limits of this content

This content comes from the small mammals chapter of the veterinary encyclopaedia (the original location and content hash are in the evidence chain). The sources at the end are the authoritative material cited by that section. This chapter has no row-level anchors in the project's line-level anchor file; only the chapter-level content hash can be verified — the same level as this site's existing "group overview" articles for each chapter — which does not mean every sentence traces to a particular source. Where the source text could not find an authoritative figure it leaves the field blank and states the reason; this site preserves that as it stands and does not fill in a number on its behalf. This is educational information and cannot replace diagnosis and prescription by a practising veterinarian; in an emergency, seek care immediately. This article has not been clinically reviewed by a named veterinarian.

"Source text line N" in the table is a line number in the original teaching-material inventory used when this project's database was built; it is an internal traceability marker and that inventory is not public. It is the book and journal titles outside the parentheses that are the sources you can look up for yourself.

FAQ

What is most often fed wrongly to hamsters, gerbils, rats and mice?: Omnivorous pelleted feed as the staple, a moderate amount of vegetables and fruit, and avoidance of high-fat treats that cause obesity and cheek pouch impaction. Common feeding mistakes: too many sunflower-seed-type treats, and soft wet food packed into the cheek pouch and not cleared, leading to fermentation and infection. ｜ Omnivorous pelleted feed, a moderate amount of seeds, vegetables and fruit; they naturally hoard food. Common feeding mistakes: too many high-fat treats. ｜ Omnivorous pelleted feed, a moderate amount of fresh vegetables and fruit, with obesity to be guarded against. Common feeding mistakes: human food high in sugar and salt, and overfeeding. ｜ As for rats but in smaller portions. Common feeding mistakes: misjudging portion size, leading to obesity or an unbalanced diet.; ハムスター／スナネズミ／ラット／マウスの給餌で最も間違えやすいのは何ですか。 — 雑食性のペレット飼料を主体とし、野菜・果物を適量与え、肥満と頬袋の詰まりを招く高脂肪のおやつは避けます。よくある給餌の誤り：ヒマワリの種などのおやつの与えすぎ、柔らかく湿った食べ物が頬袋に詰まったまま取り出されず発酵して感染を起こす。｜雑食性のペレット飼料、種子・野菜・果物を適量。生来、食べ物を貯め込む性質があります。よくある給餌の誤り：高脂肪のおやつの与えすぎ。｜雑食性のペレット飼料、新鮮な野菜・果物を適量。肥満を防ぐ必要があります。よくある給餌の誤り：高糖・高塩のヒトの食べ物、与えすぎ。｜ラットと同じですが量はより少なめ。よくある給餌の誤り：量の見当がつかず、太りすぎや栄養の偏りを招く。; What is most often fed wrongly to hamsters, gerbils, rats and mice? — Omnivorous pelleted feed as the staple, a moderate amount of vegetables and fruit, and avoidance of high-fat treats that cause obesity and cheek pouch impaction. Common feeding mistakes: too many sunflower-seed-type treats, and soft wet food packed into the cheek pouch and not cleared, leading to fermentation and infection. ｜ Omnivorous pelleted feed, a moderate amount of seeds, vegetables and fruit; they naturally hoard food. Common feeding mistakes: too many high-fat treats. ｜ Omnivorous pelleted feed, a moderate amount of fresh vegetables and fruit, with obesity to be guarded against. Common feeding mistakes: human food high in sugar and salt, and overfeeding. ｜ As for rats but in smaller portions. Common feeding mistakes: misjudging portion size, leading to obesity or an unbalanced diet.
What signs in hamsters, gerbils, rats and mice mean going to the vet immediately?: Acute watery diarrhoea with dehydration; a torpid state from which the animal cannot be roused (normal hibernation-like torpor must be excluded first). ｜ Persistent seizures that do not settle; traumatic degloving of the tail (never grasp the tail tip). ｜ Severe respiratory distress; a ruptured, bleeding tumour. ｜ Severe traumatic fighting wounds; respiratory distress.; ハムスター／スナネズミ／ラット／マウスにどんな状態が出たらすぐ受診すべきですか。 — 急性の水様便による脱水、昏睡状態で呼んでも起きない（まず正常な冬眠様 torpor を除外してから判断します）。｜持続するてんかん発作が治まらない、外傷による尾の皮剥け（尾の先端を決してつかまないこと）。｜重度の呼吸困難、腫瘍の破裂による出血。｜重度の闘争による外傷、呼吸困難。; What signs in hamsters, gerbils, rats and mice mean going to the vet immediately? — Acute watery diarrhoea with dehydration; a torpid state from which the animal cannot be roused (normal hibernation-like torpor must be excluded first). ｜ Persistent seizures that do not settle; traumatic degloving of the tail (never grasp the tail tip). ｜ Severe respiratory distress; a ruptured, bleeding tumour. ｜ Severe traumatic fighting wounds; respiratory distress.
What is the most common disease in hamsters, gerbils, rats and mice?: 1. Wet tail (proliferative ileitis): bacterial, precipitated by stress, with young hamsters at high risk → acute watery diarrhoea, dehydration, lethargy, deteriorating very rapidly with high mortality. Merck verbatim: 「Proliferative ileitis is the most consequential intestinal disease of 3- to 10-week-old Syrian hamsters and results in high mortality rates」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/hamsters>, verified 2026-07-30. → what may be cited is "Syrian hamsters aged 3–10 weeks, high mortality", not any figure in hours or days. ⚠️ The practical meaning for keepers is unchanged and more honest: do not wait out any number of hours — acute watery diarrhoea is an emergency in itself*→ physical examination/faecal testing → emergency supportive care plus antibiotics (prescription) → reduce weaning and transport stress. ｜ 1. Seizures: hereditary or stress-precipitated, mostly benign and self-limiting → brief rigidity/convulsion followed by spontaneous recovery → history and physical examination to exclude other causes → usually no treatment needed, but frequent episodes warrant veterinary attention → avoid excessive startling. ｜ 1. Chronic respiratory disease (mycoplasma-related): environmental ammonia/mycoplasma infection → sneezing, coarse respiratory sounds, reduced activity → auscultation/radiography → antibiotics plus environmental improvement (prescription) → keep the cage clean and ventilated. ｜ 1. Fighting injuries (an extension of barbering): social hierarchy conflict → skin bite wounds, hair loss → physical examination → wound management/isolation of the aggressor (prescription as needed) → assess social compatibility within the cage.; ハムスター／スナネズミ／ラット／マウスで最もよくある疾患は何ですか。 — 1. ウェットテイル（Wet tail、増殖性回腸炎）：細菌性でストレスが誘因。幼若なハムスターは高リスク→急性の水様便、脱水、嗜眠。悪化が非常に速く死亡率が高い。Merck の逐語は「Proliferative ileitis is the most consequential intestinal disease of 3- to 10-week-old Syrian hamsters and results in high mortality rates」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/hamsters>、確認 2026-07-30。→ 引用できるのは「3–10 週齢のシリアンハムスター、死亡率が高い」であって、時間や日数の数字ではありません。⚠️ 飼い主にとっての実際的な意味は変わらず、より誠実です：時間を待たないでください。急性の水様便が出た時点で救急です*→身体検査／糞便検査→緊急の支持療法＋抗菌薬（処方）→離乳・輸送によるストレスの低減。｜ 1. てんかん発作：遺伝またはストレスが誘因で、多くは良性かつ自己限定的→短時間の硬直／痙攣ののち自然に回復→病歴と身体検査で他の原因を除外→通常は治療不要ですが、発作が頻回なら受診が必要→過度に驚かせない。｜ 1. 慢性呼吸器疾患（マイコプラズマ関連）：環境中のアンモニア／マイコプラズマ感染→くしゃみ、粗い呼吸音、活動性の低下→聴診／X 線→抗菌薬＋環境改善（処方）→ケージの清潔と換気を保つ。｜ 1. 闘争による外傷（バーバリングの延長）：社会的順位をめぐる衝突→皮膚の咬傷、脱毛→身体検査→創傷処置／攻撃個体の隔離（必要に応じて処方）→ケージ内の社会的相性を評価する。; What is the most common disease in hamsters, gerbils, rats and mice? — 1. Wet tail (proliferative ileitis): bacterial, precipitated by stress, with young hamsters at high risk → acute watery diarrhoea, dehydration, lethargy, deteriorating very rapidly with high mortality. Merck verbatim: 「Proliferative ileitis is the most consequential intestinal disease of 3- to 10-week-old Syrian hamsters and results in high mortality rates」<https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/hamsters>, verified 2026-07-30. → what may be cited is "Syrian hamsters aged 3–10 weeks, high mortality", not any figure in hours or days. ⚠️ The practical meaning for keepers is unchanged and more honest: do not wait out any number of hours — acute watery diarrhoea is an emergency in itself*→ physical examination/faecal testing → emergency supportive care plus antibiotics (prescription) → reduce weaning and transport stress. ｜ 1. Seizures: hereditary or stress-precipitated, mostly benign and self-limiting → brief rigidity/convulsion followed by spontaneous recovery → history and physical examination to exclude other causes → usually no treatment needed, but frequent episodes warrant veterinary attention → avoid excessive startling. ｜ 1. Chronic respiratory disease (mycoplasma-related): environmental ammonia/mycoplasma infection → sneezing, coarse respiratory sounds, reduced activity → auscultation/radiography → antibiotics plus environmental improvement (prescription) → keep the cage clean and ventilated. ｜ 1. Fighting injuries (an extension of barbering): social hierarchy conflict → skin bite wounds, hair loss → physical examination → wound management/isolation of the aggressor (prescription as needed) → assess social compatibility within the cage.

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獸醫百科編輯部・《Hamsters/gerbils/rats/mice | Husbandry and health: a 12-column knowledge tree》・IDAEO 知識庫・2026-08-13・https://km.idaeo.ai/post/vet/pet-rodent-guide

Updated 2026-08-14

更新 2026-08-14T15:32:41.579Z · server-rendered · four-language · IDAEO 知識庫

Hamsters/gerbils/rats/mice | Husbandry and health: a 12-column knowledge tree

Hamsters/gerbils/rats/mice | Husbandry and health: a 12-column knowledge tree (Hamster/Gerbil/Rat/Mouse)

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