Main article: Grape and raisin toxicity in dogs. These include any fruit of the Vitis species. It is unclear what substance within these fruits is toxic to dogs. There are several theories: mycotoxin, salicylate, or tartaric acid (including tartrates like potassium bitartrate), are all naturally found in grapes...
Overview Grape and raisin toxicosis happen when a dog ingests fruits from the Vitis genus. Eating grapes, raisins, Zante currants, or sultanas can cause acute kidney injury (AKI) in dogs. The exact amount of fruit that causes toxicity is unknown, and some dogs may become sicker than others. Since it's impossible to predict which dog will be affected or how much fruit will cause signs of ...

Can dogs eat grapes? Learn why grapes are dangerous, symptoms of poisoning, and what to do if your dog eats one.

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Grape toxicity has previously been difficult to assess. After ingesting grapes, some dogs suffered mildly, while others had acute renal failure. Knowing that tartaric acid is the culprit explains much. Grapes, raisins and sultanas contain different levels of tartaric acid based on the type of grape, where it was grown and ripeness.