For dogs · Free tool

My dog ate grapes or raisins

Grapes, raisins, currants, and sultanas can cause sudden kidney failure in dogs — and there's no amount known to be safe. Because some dogs are harmed by just a few while others aren't, and because a dog can look fine while the damage begins, any ingestion is treated as an emergency. Call your vet or a pet poison line right away.

Treat as an emergency

There is no known safe amount of grapes or raisins for a dog. Some dogs develop kidney failure after just a handful while others eat more with no effect — the amount simply doesn't predict who gets sick. Because early treatment dramatically improves the outcome, and dogs often look fine during the window when it matters most, call your vet or a pet poison line now, no matter how little they ate.

What to do now

  • Call your vet or a pet poison line right away — the Pet Poison Helpline at (855) 764-7661 or ASPCA Animal Poison Control at (888) 426-4435.
  • Note what and roughly how much — grapes, raisins, sultanas, currants, or a food that contains them (raisins are far more concentrated than fresh grapes).
  • Don't wait for symptoms: vomiting can be delayed 6–12 hours and kidney signs 24–72 hours.
  • If a vet advises inducing vomiting, it's most effective within the first couple of hours — so make the call quickly.
  • Bring the packaging if you have it, so the team can gauge the amount.
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Pet Poison Helpline (855) 764-7661ASPCA Animal Poison Control (888) 426-4435

General triage guidance, not a diagnosis — based on the Merck Veterinary Manual, ASPCA Animal Poison Control, and Pet Poison Helpline. Because susceptibility is individual and there's no established safe dose, the amount eaten should never be used to rule out concern in a dog. When in doubt, call.

Sources: Merck Veterinary Manual — Grape, Raisin, and Tamarind Toxicosis in Dogs; ASPCA APCC — Toxic Component in Grapes and Raisins Identified (tartaric acid); Pet Poison Helpline — Grapes & Raisins

Common questions

How many grapes or raisins are toxic to a dog?

There's no number that's known to be safe. Dogs have developed kidney failure after as few as four or five grapes, while others have eaten more with no effect — so vets don't rely on the amount to decide who's at risk. Raisins, sultanas, and currants are dried and more concentrated than fresh grapes, so even a small handful can carry a large toxic load.

My dog ate one grape — should I worry?

It's worth a call. Because susceptibility is so individual and there's no established safe dose, the safest approach is to phone your vet or a pet poison line, tell them your dog's weight and what they ate, and follow their advice. Many dogs are fine, but the ones who aren't do far better when treated early.

What are the signs of grape or raisin poisoning in dogs?

Vomiting and/or diarrhea usually come first, often within 6–12 hours, along with lethargy, appetite loss, and belly pain. Kidney failure develops over the next 24–72 hours — first increased thirst and urination, then reduced urination, ammonia-smelling breath, and worsening weakness. Waiting for these signs means missing the best treatment window.

Why are grapes toxic to dogs but not people?

The leading explanation is tartaric acid, which grapes contain in varying amounts. Dogs are poor at excreting it, so it builds up and injures the kidney's filtering cells. People and many other species clear it easily. The same reason is why cream of tartar and tamarind — also high in tartaric acid — are flagged as risks for dogs.

More pet safety tools

Dog chocolate toxicity calculatorEstimate the risk from what your dog ate by weight, chocolate type, and amount.Dog xylitol toxicity calculatorSugar-free gum, mints, and some peanut butters. Estimate the risk by your dog's weight and how much they ate.Dog ibuprofen (Advil) toxicity calculatorAdvil, Motrin, and generic ibuprofen. Estimate the risk by your dog's weight and how many they ate.

These tools estimate risk — they don't replace your veterinarian and can't examine your pet. For anything worrying, or when in doubt, get a free triage assessment or call your vet.