Grapes can be potentially dangerous for dogs. Although some dogs may eat grapes without problems, there are some ingredients in grapes that may affect the dog's health.

First of all, grapes may contain trace amounts of toxins, which may cause damage to the dog's liver and kidneys. Even a small amount of grapes may cause digestive system problems such as vomiting, diarrhea, and abdominal pain in dogs, and in severe cases may lead to acute renal failure.