The exact mechanism behind grape and raisin toxicity is not established even in dogs, where it is best documented; a link to tartaric acid has been proposed but not confirmed, and the reaction appears idiosyncratic — not every exposed animal is affected. In cats specifically, the evidence is more limited: there are anecdotal and occasional case reports of cats developing similar signs, but sources describe the true toxicity risk in cats as unknown.
Because the mechanism is unconfirmed and the precise amount that causes illness is unknown even in the better-documented dog cases, no safe amount is established for cats. Veterinary sources still recommend avoiding grapes, raisins, and currants for cats as a precaution, since severe cases (in dogs) have involved acute kidney failure.
No — most of the case evidence for grape and raisin toxicity comes from dogs. Evidence in cats is limited to anecdotal and occasional case reports, and sources describe the actual risk to cats as unknown, though they still recommend avoiding grapes and raisins as a precaution.
Contact a veterinarian or pet poison hotline right away, even if your cat seems fine. Kidney damage can follow, and prompt advice matters, so do not wait for symptoms.
General public resources referenced while researching this tool's topic.
General educational guidance based on the references above, not veterinary advice. See our editorial policy for how we choose sources.
This tool is intended for educational purposes only and should not be used as a substitute for emergency veterinary advice, diagnosis, or treatment.
If your pet may have consumed toxic foods, chocolate, medications, chemicals, or other dangerous substances, seek immediate help from a licensed veterinarian or emergency animal service in your area. Do not delay professional care based on calculator or search results alone.
Pet poison hotlines (24/7, US and Canada):
ASPCA Animal Poison Control Center: (888) 426-4435
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Pet Poison Helpline: (855) 764-7661
Pet Poison Helpline states its service covers the U.S., Canada and the Caribbean. The ASPCA line is also used by Canadian pet owners. A consultation fee may apply to both. In Canada, your nearest 24-hour emergency vet clinic is the best first call; elsewhere, use local emergency veterinary directories.
How we calculate results: This tool uses commonly referenced veterinary toxicity thresholds and food safety guidelines. Actual toxicity can vary based on your pet's size, health status, and exact substance consumed. These results are estimates only and do not replace a veterinary assessment.