VeterUSA · Emergency triage
Did your dog eat grapes or raisins?
This also covers raisins, sultanas, currants, and anything baked with them — raisin bread, trail mix, cereal, cookies. Enter what you know for a risk level and what to do next.
There is no safe amount, and no way to predict it. Some dogs develop kidney failure from a few grapes; others eat many with no effect. Because it's unpredictable, any amount should be reported right away.
Rough reference
- 1 grape~5 g
- Small handful of grapes~50 g
- Mini snack box of raisins~14 g
- 1 oz raisins (small handful)~28 g
Don't have an exact amount? Estimate high and call — the dose that harms one dog won't harm another, so the number is only a guide.
Both helplines are staffed 24/7 by veterinary toxicologists. A consultation fee may apply. If your dog is already vomiting, lethargic, or not urinating normally, skip the calculator and go to the nearest ER now.
How grape and raisin poisoning in dogs works
Grapes, raisins, currants, and sultanas can cause sudden kidney failure in dogs. The toxic principle is now believed to be tartaric acid (and its salt, potassium bitartrate), which grapes contain in varying amounts — likely part of why the danger is so unpredictable.
Why there's no "safe" number
Grape toxicity is idiosyncratic: it varies from dog to dog and from grape to grape. Some dogs eat a large quantity with no harm; others develop kidney failure after just a few. The lowest documented toxic dose cited by the ASPCA is roughly 0.3 grams per kilogram of body weight, but because sensitivity varies so much, veterinary toxicologists treat any ingestion as potentially dangerous. That's why this tool never shows a "safe to ignore" result.
Raisins vs grapes
Raisins, currants, and sultanas are dried, so they pack more of the toxin into each gram than fresh grapes — a small box of raisins can represent the equivalent of a much larger serving of grapes. Watch especially for hidden sources like raisin bread, trail mix, granola, and baked goods.
What to watch for
Vomiting (often within a few hours), then lethargy, loss of appetite, and reduced or absent urination as the kidneys are affected over the following one to three days. Early treatment — decontamination and IV fluids — gives the best chance of protecting the kidneys, which is why prompt action matters even if your dog seems fine.
Is this calculator a substitute for a vet?
No. Because toxicity is unpredictable, the result is only a guide to urgency, not a safety guarantee. For any grape or raisin ingestion, call a veterinarian or an animal poison control line rather than wait and watch.