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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.

