If the dog consumes them in large quantities, then yes. Additionally dogs should also not be allowed to eat raisins or chocolate. All of these things can be fatal to the animal.
Although some dog owners do give grapes or raisins to their dogs as treats, large quantities of those foods are believed to cause vomiting, diarrhea, and even kidney failure.
One or two grapes accidentally likely won't cause any problems, but in general dogs should not be fed grapes. They have been linked to renal failure in your canine friend! (That means their kidneys may stop functioning properly. ) It is best to avoid feeding your furry buddy any grapes at all.
Yes, grapes and raiseis are toxic to dogs. By eating grapes and raisins, a dog's kidneys could become damaged, and they could go into kidney failure and even die.
Grapes and raisins can raise the level of toxicity in dogs can do damage to the kidneys. The grapes may cause the kidneys to shutdown as well as severe urinating problems. If your dog has eaten a grapes, call the vet. I would not recommend feeding the dog grapes because they certainly can die from it.