Quick Answer

Grapes (Seedless Red/Green) is NOT safe for your Dogs. Grapes are extremely poisonous to dogs, capable of triggering acute kidney failure even after a single grape in susceptible individuals. The exact toxic principle remains unidentified, but it causes rapid renal tubular necrosis, manifesting as vomiting, lethargy, and anuria within hours. All grape varieties—seedless, seeded, organic, and commercial—are equally dangerous, and the lethal dose can be as little as 0.3 ounces of grapes per pound of body weight. There is no safe amount; any ingestion demands immediate emergency intervention.