Grape & Raisin Toxicity Calculator

The toxic threshold is approximately 19.6 g of grapes per kg body weight. For a 10-kg dog, that is about 200 g of grapes. Raisins are about 7 times more concentrated, so only 2.8 g/kg is needed. Since individual sensitivity varies greatly, any ingestion should be treated as an emergency.

Raisins are dried grapes. Through dehydration, the toxic substance (likely tartaric acid) becomes concentrated. 100 g of raisins equals about 700 g of fresh grapes. Even small amounts of raisins can cause acute kidney failure in dogs.

Within 6-12 hours, vomiting, diarrhea, and loss of appetite occur. Without treatment, acute kidney failure can develop within 24-72 hours. Contact your vet immediately. Within 2 hours, the vet can induce vomiting and administer activated charcoal.