How many grapes are toxic to a dog?

There is no proven safe amount. Toxicity has been reported at roughly 0.7 oz of grapes per kg of body weight, but some dogs react to far less. Raisins are more concentrated and more dangerous. Any ingestion should be taken seriously.

What are the symptoms of grape poisoning in dogs?

Vomiting (often within hours), then diarrhea, lethargy, loss of appetite, and reduced urination as kidney injury develops over 24–72 hours.

What should I do if my dog ate grapes or raisins?

Call your vet or pet poison control right away, regardless of the amount. Early decontamination (inducing vomiting) and IV fluids dramatically improve outcomes.

Grape & Raisin Toxicity Checker

Did your dog eat grapes or raisins? Check the risk by weight and amount eaten.

🚨 There is no proven safe dose — some dogs react to very small amounts. If your dog ate any grapes or raisins, call your vet or: ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661 (US).

Dog's weight

What did your dog eat?

Number of grapes eaten

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Why grapes and raisins are dangerous

Grapes, raisins, sultanas, and currants can cause sudden acute kidney failure in dogs. The exact toxin is now believed to be tartaric acid, but sensitivity varies enormously — some dogs eat grapes with no effect, while others develop kidney failure from just a few. Because you can't know which type your dog is, every ingestion is treated as potentially serious.

Reported risk thresholds (use with caution)

Grapes: concern reported from ~0.7 oz per kg of body weight (about 1–2 grapes per kg), but lower amounts have caused illness.
Raisins: more concentrated — concern from ~0.1 oz per kg.

These figures are guidelines only. Many vets recommend treating any grape or raisin ingestion.

Symptoms to watch for

Vomiting within a few hours is often the first sign, followed by lethargy, diarrhea, loss of appetite, abdominal pain, and decreased urination over 24–72 hours as the kidneys are affected. Early treatment is critical — once kidney failure sets in, the outlook is much worse.

⚠️ Because sensitivity is unpredictable, a "low risk" result here does not mean it's safe to wait. When in doubt, call your vet or poison control immediately.

Frequently asked questions

My dog ate one grape — should I worry?

Most large dogs tolerate a single grape, but because some dogs are highly sensitive, it's safest to call your vet or poison control for guidance based on your dog's size.

Are raisins worse than grapes?

Yes. Raisins are dried and far more concentrated, so a smaller number can deliver a more dangerous dose.

What about grape juice, jelly, or wine?

Grape-based products can also be risky and may carry added dangers (alcohol, xylitol, sugar). Keep all of them away from dogs.