Grape & Raisin Toxicity Calculator for Dogs

Why grapes and raisins are so dangerous

Grapes, raisins, currants, and sultanas can cause acute kidney injury in dogs. What makes them especially frightening is how unpredictable they are: the toxic dose varies enormously from dog to dog, and there is no amount known to be safe. Raisins are dried, so they’re more concentrated than fresh grapes.

Why we don’t give an “all clear”

The dose figure above is shown only for context. Because some dogs react severely to tiny amounts, a “low” number is never a green light. The safest course after any ingestion is to call your vet or a poison control line — early treatment, before symptoms appear, gives the best chance of protecting the kidneys.

Frequently asked questions

How many grapes or raisins are toxic to a dog?

There is no known safe amount. Grape and raisin toxicity is idiosyncratic — some dogs eat several with no effect, while others develop acute kidney injury from just a few. Raisins are more concentrated than grapes. Because it’s unpredictable, any ingestion should be treated as a potential emergency.

What are the symptoms of grape or raisin poisoning?

Early signs include vomiting (often within a few hours), diarrhea, lethargy, and loss of appetite. As kidney injury develops over 24–72 hours, you may see increased or decreased urination, increased thirst, and weakness. By the time severe signs appear, treatment is much harder — so act early.

My dog ate one grape — should I worry?

Don’t assume it’s fine. Because sensitivity varies so much, vets generally recommend calling a poison control line or your veterinarian even after a single grape or raisin, especially for small dogs. They can advise whether to induce vomiting or monitor.

What will the vet do?

If caught early, treatment often involves inducing vomiting, giving activated charcoal, and intravenous fluids to protect the kidneys, along with blood tests to monitor kidney function. Early intervention before symptoms appear gives the best outcome.