Small mammals such as rats, mice, gerbils, chinchillas and ferrets each have their own health quirks. What they share is a fast metabolism and a tendency to hide illness, which means problems can escalate quickly. A vet who treats small mammals regularly will know species-specific risks and safe drug doses for very small bodies.
This guide is part of our exotic pet vet guide. For rabbits, guinea pigs and hamsters, see their dedicated guides linked below.
Key takeaways
- Not eating for even a day is serious in small mammals.
- Each species has signature problems: respiratory disease and tumours in rats, dental disease in chinchillas, adrenal and insulinoma disease in ferrets.
- Ferrets may need vaccinations, such as against canine distemper, depending on where you live.
- Choose a vet who sees your species often, not just “exotics” in general.
Common problems by species
| Species | Typical lifespan | Common health problems |
|---|---|---|
| Rats | About 2 to 3 years | Respiratory infections (often linked to Mycoplasma), mammary tumours in females, skin mites |
| Mice | About 1.5 to 2 years | Tumours, skin problems, respiratory disease |
| Gerbils | About 3 to 4 years | Tail injuries (never lift by the tail), seizures, scent gland tumours, nose sores |
| Chinchillas | Often 10 years or more | Dental disease, heatstroke, fur slip, gut problems |
| Ferrets | About 6 to 8 years | Adrenal gland disease, insulinoma, swallowed foreign objects, dental disease |
Warning signs that need a vet
- Not eating, or eating less than usual
- Sneezing, noisy breathing, red discharge around the eyes or nose (in rats, a red pigment called porphyrin can indicate stress or illness)
- Lumps or swellings
- Diarrhoea or no droppings
- Drooling or pawing at the mouth
- In ferrets: weakness, staring, drooling or collapse (possible low blood sugar from insulinoma), hair loss on the tail and body (possible adrenal disease), vomiting or straining (possible blockage)
- In chinchillas: panting or lethargy in warm weather, which can be heatstroke
What to ask a small mammal vet
- How many patients of my species do you see each month?
- Can you weigh accurately in grams and anaesthetise very small patients?
- Do you offer in-house X-rays and dental equipment for small mammals?
- Who covers emergencies for exotic pets after hours?
Read how to choose a vet for more general tips.
Checkup schedule
A first visit after adoption is worthwhile for any small mammal. Ferrets and chinchillas, with their longer lives, benefit from annual exams. Short-lived species like rats and mice should be checked whenever weight drops or behaviour changes, and more often in later life.
Frequently asked questions
Do ferrets need vaccinations?
In some countries, ferrets are vaccinated against canine distemper, which is usually fatal in ferrets, and against rabies where required. Ask your vet what applies where you live.
Can pet rats be spayed?
Yes. Spaying female rats can reduce the risk of mammary tumours, which are very common in older females. Discuss timing and anaesthetic risk with an experienced vet.
Related guides
This guide is general information for pet owners and is not a substitute for an examination by a licensed veterinarian. If your pet is unwell, contact your vet.
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