What to Feed Your Pet Rats: The Complete Diet Guide

Quick answer: give your rats a complete food made for rats as the main part of their diet. Offer small amounts of varied fresh foods within their daily food allowance, not on top of it. Keep fresh drinking water available and use some of the usual food for foraging. RSPCA rat diet advice

How much to feed depends on the rats, their weight and what they leave behind. Ask a rat-savvy vet about a suitable amount if their weight or appetite changes. The Woodgreen feeding guide gives an example allowance, but it is not a universal portion.

Can rats eat…?

A short food guide. Keep fresh additions within the usual allowance; the avoid list overrides the broad food groups.
Food Guidance Source
Complete rat-specific pellets Main diet RSPCA
Vegetables and fruit Small, varied amounts within the daily allowance RSPCA
Cooked egg, grains and seeds Small amounts within the daily allowance RSPCA
High-sugar or high-fat foods, including dairy Occasional treats, not everyday food RSPCA
Onion, citrus fruit, walnuts, rhubarb, grapes, raisins and chocolate Avoid RSPCA

Some welfare sources differ on individual foods. If you are unsure about a food, ask a rat-savvy vet before offering it.

Pellets or seed mix?

Complete pellets (also called lab blocks or nuggets) blend protein, fat, fibre, vitamins and minerals into every piece, so it does not matter which piece a rat picks up first.

Seed mixes look appealing, but they allow selective feeding: rats can pick out the tastier, fattier parts and leave the rest. That is why welfare guidance puts a complete rat food at the centre of the diet.

A seed mix can still be useful as scatter feed for enrichment, sprinkled around the cage or hidden in a foraging toy, as long as the complete food stays the main meal.

Fresh foods to offer

Fresh food adds variety and gives rats something to work at. Offer small amounts that will be eaten within a few hours, and remove anything left before it spoils. Introduce new foods one at a time so you can spot anything that does not agree with them.

Vegetables

  • Broccoli (small amounts)
  • Kale and pak choi
  • Peas, fresh or thawed
  • Cucumber
  • Cooked sweet potato
  • Carrot
  • Bell pepper
  • Cooked butternut squash
  • Spring greens and romaine lettuce

Fruit, as a smaller extra

  • Banana, in small pieces
  • Blueberries
  • Apple, with the seeds removed
  • Strawberry
  • Melon

Foods to avoid

Avoid

Take a cautious approach with disputed foods. UK welfare guidance conflicts on grapes: the RSPCA advises avoiding grapes and raisins, while Woodgreen lists grapes as a small treat. This guide follows the more cautious advice, so leave out grapes and raisins unless your exotic vet specifically says otherwise. Also avoid raw dry beans, raw onion, chocolate, alcohol, caffeine and sticky sweets.

Sources: RSPCA rat diet guidance and Woodgreen rat care guidance.

Treats and training

Rats are very food-motivated, which makes training easy. Use tiny, pea-sized pieces so a whole training session adds up to very little food. Treats are for bonding, training and variety, not a replacement for the main diet. Sugary shop-bought treats such as yoghurt drops are best kept occasional.

Water

Fresh water must be available at all times. Bottles stay cleaner; bowls allow a more natural way of drinking but collect bedding and droppings quickly. Many owners use both, so there is a backup if a bottle valve sticks. Check the bottle every day and clean it regularly.

Signs the diet needs a look

  • Pellets left untouched while treats vanish: cut back the extras until the main food is being eaten.
  • Weight gain, trouble grooming or a waddling walk: review portions and treats, and add more ways to move and forage.
  • Dull, thinning or greasy coat or soft droppings: think about what changed recently, and speak to a vet if it continues.

Weighing your rats regularly makes changes easier to spot. Any sudden change in weight or appetite is a reason to see a rat-savvy vet.

Can rats eat common human foods?

Use common human foods as tiny extras, not the main diet. A complete rat food should stay as the base, with small fresh-food portions for variety and enrichment.

  • Avoid avocado, grapes, raisins, onion, garlic, chocolate, alcohol, caffeine and sticky sweets.
  • Fruit such as mango or peach should be a small occasional treat, not a daily staple.
  • Peas, rice and leafy greens can be offered in small amounts when prepared plainly, but variety matters more than one single food.
  • Rabbit or guinea pig food is not a proper staple for rats. Use a rat-appropriate complete food instead.
  • If a rat is unwell, very young, elderly, pregnant or has breathing or weight problems, ask an exotic vet before changing diet.

Common questions

Can rats eat hamster food?

It is not a good staple. Hamster food is made for a different animal. Use a complete food made for rats.

How often can I give treats?

Small treats every day are fine when they are tiny and the complete food is still the main diet.

Bottle or bowl?

Both work. A bottle keeps water cleaner; a second source gives a backup if one fails.

Updated September 2026 from RSPCA and Woodgreen guidance. This guide is not a substitute for advice from a vet.

For housing and enrichment alongside feeding, see the Rat Care hub.