Balanced rat nuggets/mix plus fresh veg and protein
Time
Daily interaction and out-of-cage time
Cost
Medium
Overview
The fancy rat is an intelligent, sociable domesticated rodent often regarded as one of the more interactive small pets.
Rats can bond with their keepers, learn simple tasks and enjoy genuine interaction.
They are social and should not be kept alone, needing at least one same-sex companion.
Their main drawbacks are a short lifespan and a high rate of tumours and respiratory disease.
Housing
Provide a tall, multi-level wire cage with bars suitable for climbing, large enough for at least two rats, with bar spacing close enough to prevent escape.
Fill it with hammocks, ropes, platforms, hides and tunnels.
Use dust-free, low-ammonia bedding and avoid pine and cedar.
Daily out-of-cage time in a safe, supervised space is essential for exercise and bonding.
Keep the cage clean, well-ventilated and out of draughts and direct sun.
Diet
Feed a balanced commercial rat nugget or a well-formulated grain mix as the staple, supplemented with daily fresh vegetables, occasional fruit and small amounts of cooked protein.
Variety supports their omnivorous nature.
Provide constant fresh water from a bottle.
Limit fatty, sugary and salty human foods to prevent obesity.
Foraging toys and scatter feeding give useful mental stimulation for these intelligent animals.
Health
Rats are very prone to respiratory infections, particularly mycoplasma, so clean, dust-free, well-ventilated housing is crucial; watch for sneezing, porphyrin (red) staining and laboured breathing.
Mammary and pituitary tumours are common, especially in females.
Their short lifespan means health can decline quickly.
Neutering can reduce some tumours and hormonal aggression.
Find a rat-experienced exotics vet early, as prompt treatment greatly improves outcomes.
Temperament
Fancy rats are generally gentle and clever, often seeking out their owners, riding on shoulders and learning to respond to their names.
With regular handling they become interactive companions.
They are highly social and do best in same-sex groups, grooming and sleeping in a pile together.
A lone rat suffers, so keep two or more, introducing newcomers carefully to maintain a harmonious group.
A good fit for
Keepers wanting an interactive, trainable pet
Those able to provide daily handling
Owners committed to keeping groups
People prepared for a short lifespan
Common mistakes to avoid
Keeping a single rat alone
Respiratory disease from poor ventilation/bedding
Small cages with no climbing height
Ignoring lumps and breathing changes
Is your enclosure big enough?
Matched to the dumbo rat guide, which states 80x50x80 cm for a pair.
Rats are the most respiratory-fragile common small pet. Listen to them in a quiet room once a week.
Go now
Clicking, wheezing, or a hunched posture with laboured sidesGo now. Respiratory disease is the leading cause of death in pet rats and progresses quickly.
Now
Today
Red staining around the eyes or noseCall today. Not blood. It is a stress and illness secretion, and it appears before the wheeze does.
Today
A lump, especially in a femaleBook an appointment. Mammary tumours are common, usually benign, and far simpler to remove while small.
This week
Rats must live in same-sex groups of two or more. A solitary rat becomes withdrawn and stops thriving.
This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it — and the time to find one is before you need one.
Can a fancy rat eat that?
Rats are true omnivores and the most food-tolerant animal on this site — which makes the short list of genuine dangers the important part.
Never (15)
AlcoholNo safe amount at any body weight on this site.
never
AvocadoPersin, concentrated in the skin, stone and leaves. Implicated in cardiac damage across birds, rodents and reptiles.
never
Blue cheeseThe mould produces a toxin rats are unusually sensitive to.
never
CaffeineCoffee, tea and energy drinks. Cardiac and neurological toxicity at tiny doses for an animal this size.
never
Carbonated drinksRats cannot burp. Gas has nowhere to go.
never
ChocolateTheobromine. The commonly-repeated claim that a little is good for a rat with a chest infection is not a reason to feed it.
never
GarlicSame allium toxicity as onion, and more concentrated by weight.
never
Green potatoSolanine.
never
LeekAllium family. Same mechanism as onion and garlic.
never
OnionOrganosulphur compounds damage red blood cells. The whole allium family is out.
never
Poppy seedsNeurologically active at rat body weights.
never
Raw or dried beansLectins, and dried beans are one of the few genuinely acute poisonings in pet rats.
never
Raw sweet potatoContains compounds that form cyanide during digestion. Cooked is fine.
never
RhubarbVery high in soluble oxalate, high enough to cause acute kidney injury. The leaves are worse than the stalks.
never
Salty or seasoned human foodSalt, oil and seasoning. Crisps, chips, seasoned leftovers and processed meat are all out.
never
Occasional (6)
CitrusFine for females. For male rats, d-limonene in the peel and oil has a documented association with kidney damage, so the peel and oil should be avoided in males. Flesh only, and not for males.
occasional
Cooked meatUnseasoned. Fine in small amounts. A small piece weekly.
occasional
Cooked pasta and riceSafe cooked, and rats enjoy them. A small amount as part of scatter-feeding.
occasional
FruitMost fruit is fine in small amounts. Banana, apple, berries, melon. A small piece a few times a week.
occasional
Plain cooked eggGood protein. A small piece twice a week.
occasional
YoghurtLive plain yoghurt is generally well tolerated, unusually for a small mammal. A teaspoon occasionally.
occasional
Everyday foods (2)
Fresh vegetablesAlmost all are fine. Broccoli, peas, carrot, courgette, greens, pepper. A small daily portion alongside the blocks.
everyday food
Rat block or lab blockA complete formulated block. Boring-looking, and much better for them than a seed mix they can selectively feed from. Available at all times.
everyday food
That food is not on our list. Rats tolerate most things, but the short list of exceptions is genuinely dangerous — check before offering.
Rats are neophobic in a useful way: they will try a tiny amount of something new and wait before eating more. That does not make an unsafe food safe.
Setup, monthly, first year and across a whole life, itemised and with the electricity worked out from the actual wattage. Published figures for the same animal disagree by a factor of four, so the calculator shows ranges rather than picking one.
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate