Grapes, raisins, and even currants (some currants are actually small, black grapes) are toxic to your dog! In fact, there have been anecdotal reports of cats and ferrets being affected by these also. Ingestion of even a small amount of grapes, raisins, or currants can result in severe, acute kidney failure. All types of grape- or raisin-containing products (including grape juice, trail mix, bagels, etc.) can result in this. Even organic, pesticide-free, grapes grown in home gardens can result in toxicity. Although the mechanism of action is not clearly understood at this time, grapes and raisins can result in anorexia, vomiting, diarrhea, and potentially severe acute renal failure (which develops several days later). The toxicity is not necessarily dose-dependent, and symptoms can occur with even small ingestions. Decontamination (i.e., inducing vomiting, decontaminating with activated charcoal, etc.), aggressive supportive care, aggressive IV fluid therapy, and kidney function (i.e., BUN/creatinine) monitoring is recommended.