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No, don't feed grapes to mice. The RSPCA says grapes, raisins and rhubarb are poisonous to mice, and RSPCA Australia lists grapes and raisins with chocolate as foods to avoid. Nobody knows a safe amount, so the careful answer is none at all, including sultanas, currants and grape juice. Ring a vet if your mouse has eaten some.
| Safe? | No, poisonous |
| How much | None |
| How often | Never |
| Best served | Not at all: offer a blueberry half instead |
| Watch out for | Not eating, not passing urine, lethargy |
Why are grapes bad for mice?
Because grapes and dried grapes are known to damage the kidneys in dogs and cats, and welfare charities treat them as poisonous to mice too. The RSPCA's mouse feeding advice says plainly: don't feed them grapes, raisins or rhubarb. RSPCA Australia lists grapes and raisins among the foods harmful to cats and dogs that mice should also avoid.
The Vet Desk explains that the toxic part of the grape is still not confirmed (tartaric acid is one suspect), that there is no known safe dose, and that the harm shows as sudden kidney failure. With a pet as small as a mouse, there is no margin for testing.
Don't some guides say grapes are fine?
Yes. Woodgreen includes grapes in its list of fruit treats for mice, and you will see owners say their mice ate grapes without trouble. We follow the RSPCA, RSPCA Australia and the Vet Desk here. Grape poisoning in dogs doesn't happen to every dog either, which is part of why it is so risky, and there is plenty of other fruit mice enjoy with no question mark over it.
Every form of grape
- Red, green and black grapes: no.
- Raisins, sultanas and currants: no. Dried fruit is also very sugary.
- Grape juice and wine: no. PetMD lists alcohol as toxic to mice.
- Fruit cake, hot cross buns, muesli and trail mix: no, they usually hide raisins.
- Grape seed extract: no. The Vet Desk says studies on it don't make grapes or seeds safe at home.
What if my mouse has eaten a grape?
- Remove the rest. Check the nest and any stash spots for pieces.
- Ring a vet the same day. An exotics vet is best. The Vet Desk says there is no antidote and treatment is supportive, so early help matters.
- Don't try to make it sick. The Vet Desk notes rodents can't vomit, so home remedies won't work.
- Watch closely. Note whether the mouse eats, drinks and passes urine, and tell the vet if any of these stop.
A mouse that goes quiet, stops eating or seems to stop passing urine after eating grapes needs a vet urgently.
What to give instead
For a small, juicy fruit treat, try half a blueberry, a sliver of strawberry or a pip-free piece of apple. Keep chocolate off the menu too. Our what can mice eat list, the pet mouse diet guide and the pet mouse care guide cover the rest.
Grape questions
Can mice eat raisins?
No. Raisins are dried grapes, and the RSPCA lists both as poisonous to mice. Raisins are also concentrated sugar, which RSPCA Australia says mice should avoid. Check treat mixes and baked goods, because raisins and sultanas turn up in a lot of them.
How many grapes are toxic to a mouse?
Nobody knows. The Vet Desk says there is no established toxic dose, and in dogs the effect varies from animal to animal. That is exactly why the safe amount to offer is none. If your mouse has eaten any, ring a vet for advice.
Are grape leaves or vines safe for mice?
We'd keep them out of the cage. No welfare source we trust lists grape leaves as safe, and they come from the same plant whose fruit charities treat as poisonous. Safe gnawing wood, such as apple wood suggested by Woodgreen, is a better choice.
