Grape and raisin toxicity is well-documented in dogs, causing acute kidney failure. The evidence in cats is less clear — but because the toxin is unknown and cats share many metabolic pathways with dogs, any grape ingestion should be treated as a potential emergency.
Why Is This Toxic to Cats?
The specific nephrotoxin in grapes has never been identified. Veterinary guidance universally recommends treating grape ingestion in cats as dangerous pending more research.
The ASPCA lists grapes and raisins as toxic to both dogs and cats. Given the stakes (kidney failure), the precautionary approach is always to contact Poison Control immediately.
| Form | Risk to Cats | Safe Amount | Action |
|---|---|---|---|
| Fresh Grapes | Unknown — precautionary HIGH | None | Call vet immediately |
| Raisins (dried) | Unknown — precautionary HIGH | None | Call vet immediately |
| Grape juice | Unknown | None | Call vet immediately |
| Grape-flavored products | Lower risk | Avoid | Monitor closely |
Symptoms & Timeline
GI Signs
Vomiting, diarrhea if toxicity occurs.
Kidney Stress
Lethargy, appetite loss. Kidney damage possible.
Critical Window
Decreased urination signals kidney involvement.
Assess
With aggressive treatment, recovery possible.
🚨 What To Do Right Now
Unknown toxin means unknown dose threshold — always treat any grape ingestion as an emergency.
Frequently Asked Questions
The evidence is less clear than for dogs, but the ASPCA classifies them as toxic to cats. Always treat as dangerous.
Call Poison Control immediately. One grape has caused kidney failure in small dogs; the precautionary principle applies to cats.
The specific toxin remains unidentified despite decades of research. This uncertainty is itself a reason for caution.
Vomiting, lethargy, and reduced urination are key signs. These may appear 6–24 hours after ingestion.
Yes — avoid sharing any food containing raisins, currants, or grapes with your cat.