Grapes and raisins can cause sudden kidney failure in dogs — and unlike chocolate, there is no established “safe” amount. Some dogs are severely affected by a handful; others tolerate more. Because you can’t know which type your dog is, every ingestion is a call-the-vet event. Use this checker to understand the urgency level.
🍇 Grape & Raisin Risk Checker
Estimates assume ~5 g per grape and ~0.5 g per raisin. Raisins are more concentrated and generally more dangerous per piece.
Why are grapes toxic to dogs?
The culprit is believed to be tartaric acid, which grapes, raisins, sultanas and currants all contain in varying amounts — that variability is why toxicity is so unpredictable. The damage happens in the kidneys, and signs can be delayed 12–24 hours: vomiting first, then lethargy, poor appetite, drinking and urinating changes.
Watch for hidden sources
Raisin bread and buns, trail mix, cereal bars, mince pies, fruit cake, oatmeal-raisin cookies, and grape juice. Baked raisins are just as dangerous. (Grape seed extract in supplements is not considered a concern.)
My dog ate grapes — what do I do?
1. Count or estimate how many, and note the time. 2. Call your vet or an emergency clinic immediately — find one with our worldwide emergency vet finder. 3. Do not wait for symptoms: treatment within a couple of hours (induced vomiting at the clinic, activated charcoal, IV fluids) protects the kidneys. 4. Don’t induce vomiting at home unless a professional instructs you.
FAQ
My dog ate one grape — is that really an emergency?
For a large dog, one grape is statistically low-risk — but documented cases exist of kidney injury from very small amounts. That’s why every vet organisation says the same thing: call. A phone call costs nothing; kidney failure is often irreversible.
Are cats at risk too?
Cats rarely eat grapes, but they’re considered susceptible — the same “call the vet” rule applies.
What about grape-flavoured medicine or sweets?
Artificial grape flavouring contains no actual grape and is not a tartaric-acid concern — but check sweets for xylitol, which is its own emergency.
This tool is a triage aid, not a substitute for veterinary care. If your dog ate grapes or raisins, contact a veterinarian — always.
