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Only a tiny amount, and not often. A crumb of mild hard cheese, about the size of a pea, now and then will not harm most rats, and the RSPCA allows dairy as a treat or training reward. But cheese is fatty and several care guides say to avoid dairy, so it is a poor regular treat. Never give blue cheese.
| Safe? | A little, rarely; never blue cheese |
|---|---|
| How much | A pea-sized crumb (under 1 g, 0.03 oz) per rat |
| How often | Occasionally, not every week |
| Best served | Mild hard cheese, plain |
| Watch out for | Blue cheese, fat, salt, weight gain, loose droppings |
Is cheese bad for rats?
Not in a crumb, but it is not good for them either. Care sources disagree a little. The RSPCA says sugary and high-fat foods, including dairy, should only be used as treats and training rewards. Burgess and RSPCA Australia go further and say to avoid dairy, and Unusual Pet Vets lists lactose among foods not to feed. A vet-reviewed guide from The Vet Desk says small amounts are fine but notes most rats do not especially love cheese. We follow the careful middle: a tiny crumb, rarely, if at all. The cartoon idea of rats craving cheese is just that.
Why blue cheese is a no
Blue cheese, along with Stilton, Roquefort, Gorgonzola and Danish blue, gets its veins from a deliberately grown fungus. Burgess singles out blue cheese as the dairy food to avoid most, and lists it as harmful to rats. Keep rats away from cheese boards. If a rat has eaten a lot of blue cheese, watch for diarrhoea, shaking or a rat who goes quiet, and ring your vet if you see any of these.
How much cheese can a rat have?
No more than a pea-sized crumb per rat, occasionally. Cheese is dense in fat and salt, and rats gain weight easily. Too much dairy can also loosen droppings. Count it as part of the day's food, and skip it for rats who are already round.
Which cheeses are better or worse?
| Cheese | OK? | Why |
|---|---|---|
| Mild Cheddar, Edam, Gouda, mozzarella | A crumb, rarely | Lower in lactose than soft cheese; still fatty |
| Cottage cheese | A fingertip, rarely | Soft and lower in fat, but more lactose |
| Blue cheeses | No | Listed as harmful by Burgess |
| Cheese with garlic, onion, chives or spices | No | Onion and garlic are on the RSPCA Australia avoid list |
| Cheese puffs, crackers, pizza | No | Salt, fat and seasoning |
If you want a high-value reward for training, a lick of plain cooked egg or a single mealworm works as well as cheese and carries less fat and no lactose.
Better treats than cheese
For a protein treat, try cooked egg or mealworms. For dairy, plain yoghurt follows the same "tiny and rare" rule. A piece of roasted peanut is another rich treat. Our safe food list for rats, rat diet guide and pet rat care hub cover the rest.
Questions owners ask
Do rats really like cheese?
Not especially. Rats will eat it, but most prefer sweet foods and many pick other treats first. The idea of rats loving cheese comes from cartoons rather than from how pet rats actually behave.
Can rats eat cheddar?
A pea-sized crumb of mild Cheddar now and then is fine for most rats. It is high in fat and salt, so keep it rare and skip it for rats who are overweight or have loose droppings.
Can rats eat blue cheese?
No. Burgess lists blue cheese as harmful to rats and says it should never be given. Keep rats away from Stilton, Roquefort, Gorgonzola and similar cheeses, and ring your vet if one has eaten a lot.
Are rats lactose intolerant?
Sources disagree on how well adult rats handle lactose, and some care guides advise avoiding dairy for that reason. Hard cheese has less lactose than milk or soft cheese, which is why a tiny crumb rarely causes trouble.