Can cats eat grapes?
No — grapes and raisins are suspected of causing acute kidney failure in cats. Since no safe amount is known, they are strictly off limits.
Which substance is dangerous?
The exact toxin has not been conclusively identified — tartaric acid is the prime suspect. What is documented are cases of acute kidney failure after grapes and raisins in dogs and, more rarely reported, in cats. Because sensitivity varies unpredictably between individuals and no safe dose exists, the only sensible rule is zero. Raisins are more concentrated and thus more dangerous than fresh grapes.
How much is dangerous?
Unknown — and that is the problem. Single animals have developed kidney failure after small amounts while others tolerated more. Treat every amount as potentially dangerous, including raisins in pastries and muesli.
Symptoms of poisoning
Vomiting and lethargy within hours; signs of kidney damage — reduced or absent urine, loss of appetite, apathy — over the following one to three days.
Emergency: what to do?
Grapes or raisins eaten? Call the vet immediately, even without symptoms — early decontamination and fluid therapy protect the kidneys. Waiting for symptoms wastes the decisive hours.
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Frequently asked questions
How many grapes are dangerous for a cat?
Nobody can say — sensitivity varies unpredictably, and no safe amount is known. That is exactly why the rule is zero.
Are raisins worse than grapes?
Yes, the drying concentrates the suspected toxin. Watch out for raisins in pastries, bread and muesli.
My cat ate a grape — do I really need the vet?
Yes, call at least. Early fluid therapy protects the kidneys; once symptoms show, damage may already be done.
Is grape juice or wine also a problem?
Yes — plus wine adds alcohol, which is toxic in itself. Nothing from the grape belongs in a cat.
Important note
This article never replaces veterinary advice. If you suspect poisoning or symptoms persist, contact your vet or the emergency veterinary service immediately.
Sources: Veterinary toxicology: grape/raisin-associated acute kidney injury in small animals. Last updated: 08/2026.
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