By Lachlan Ortega · Last updated 17 May 2026 · Health content reviewed by Priya Nair (RVN)
Pet rats — properly cared-for, kept in pairs or trios in a tall cage with daily out time — are some of the most rewarding small pets going. They learn their names. They come when called. They figure out latches, do tricks, and follow you around the room. They are also wildly under-rated because of their tails, which puts a lot of people off. If you can get past that, you’ll find a remarkable little pet.
This is our team’s working care guide. Like the guinea pig one, it leads with the non-negotiables.
TL;DR — non-negotiables
- Always at least two, ideally a trio. Solo rats become depressed and shorter-lived.
- Tall cage — 80cm+ high minimum, bar spacing 1.25cm (½ inch) max for adults, less for babies.
- Out of cage daily — at least an hour. They need it.
- Plain diet base + variety toppings — lab block or a quality rat mix as the staple, fresh produce and fresh protein as toppings.
- Exotic vet on speed dial. Mycoplasma respiratory disease is common and progresses fast.
- Females over 18 months — watch for mammary tumours, very common but very removable.
Are pet rats right for you?
| Yes if you can… | Skip if… |
|---|---|
| Get past the tail | Anyone in the house has a phobia |
| Keep at least two together | You travel a lot — they need daily out time |
| Provide a vertical cage + climbing setup | You can’t commit to a 2-3 year lifespan |
| Daily handling and out-of-cage time | You expect a quiet, low-engagement pet |
| Budget for exotic vet (their average lifespan is short partly because owners don’t take them) | You have a free-roaming cat or small dog |
Housing
Rats climb, jump, and explore vertically. A horizontal cage that’s perfect for a hamster is a holding cell for a rat. We use Critter Nation / Savic Royal Suite / Liberta Explorer-class cages — tall, multi-level, deep base, openable doors.
Minimum dimensions
- 2 adult rats: 80x50x80cm (about 320L) with 3 levels
- 3-4 rats: a Critter Nation single (DCN footprint) or equivalent — 91x63x91cm
- 5+ rats: a double Critter Nation or two-cage setup
We get asked — pet rat food FAQ
What should make up most of a rat’s diet?
About 80% lab block (Mazuri, Oxbow Regal Rat, Envigo Teklad) or a high-quality multi-grain rat mix, and 20% fresh toppings — vegetables, small fruit pieces, lean protein. About 15-20g of base food per rat per day (one heaped tablespoon).
Are rats really omnivores?
Yes — closer to a small dog than a guinea pig. They need protein (cooked chicken, egg, mealworms a few times a week), tolerate dairy in small amounts, and handle cooked grains and most cooked vegetables. The big exceptions are the citrus-peel issue for male rats and the carbonated-drinks issue (rats can’t burp).
Which signs send me to a vet?
- Red or brown crust around eyes/nose (porphyrin — stress or illness)
- Wheezing, sneezing more than once a day (mycoplasma flare-up)
- Lumps anywhere, especially in older females (mammary tumours)
- Hind-leg dragging or weakness in older males (HLD)
- Head tilt (middle-ear infection)
- Not eating for 8+ hours
Related reading
- The complete pet rat care guide
- Master food safety table
- Cross-species toxic foods reference
- RSPCA UK — Rat welfare standards
Portion sizes & serving rules
Rats are tiny, so portion sense matters. The standard fresh-topping serving for a single adult rat is roughly one teaspoon. With a trio that’s a tablespoon total. Anything larger and they cache the rest, often leaving it to spoil in a hammock corner. Removing uneaten fresh food after a few hours saves cleaning time later.
Our 80/20 split: ~80% lab block / quality rat mix, ~20% fresh toppings. The toppings should rotate through proteins, veg, and the occasional fruit treat. Two protein meals a week (cooked egg or chicken or mealworms) keep muscle tone up, especially in older rats.
Male vs female food sensitivities
One genuine sex-specific issue: d-limonene, the compound in citrus peel, is metabolised into a kidney-toxic metabolite in male rats. Female rats handle it without harm. Tiny amounts of orange flesh are fine for both — but no peel, ever, for males, and to keep it simple we avoid citrus across all our rats.
Older males (over 18 months) also benefit from higher-protein, lower-fat toppings as they trend toward muscle loss. Older females need closer monitoring for mammary lumps, which respond well to early surgery.
Enrichment-feeding ideas
- Pea fishing — frozen peas in a shallow dish of water
- Mealworm scatter in a dig box of shredded paper
- Treat ball with dry mix to puzzle out
- Smear of peanut butter on a cardboard tube interior
- Yogurt dot on a flat plate — they lap it like cats
Warning signs after a new food
- Soft or runny stool within 24 hours
- Excessive thirst (especially after sugary fruit)
- Reduced appetite for normal food
- Lethargy or hiding behaviour change
- Porphyrin (red/brown crusty) around eyes or nose — stress flag
Most issues resolve in 24 hours when the suspect food is removed. Anything persisting longer than a day, or symptoms that worsen, is a vet call. Full warning list in our complete rat care guide.
Page last updated 17 May 2026. We re-check our pet-care content regularly and update when something changes.
