Can dogs eat grapes?

Grapes and raisins are among the most dangerous foods for dogs. The exact toxic substance has not been definitively identified, though recent research suggests tartaric acid may be responsible.

What makes grapes particularly dangerous is that there is no predictable safe dose. Some dogs have become seriously ill after eating just a few grapes, while others have eaten larger quantities with fewer symptoms. Because of this unpredictability, any grape or raisin ingestion should be treated as a potential emergency.

This toxicity applies to all varieties — red, green, seedless, organic, and commercially grown. It also applies to raisins, currants, and grape juice.