Here’s another big no-no food for your puppy. Never feed it grapes. We’re not exactly sure why, but grapes are extremely dangerous for dogs to eat, and can lead to irreversible kidney damage for your puppy. Raisins, which are simply dried grapes, are just as toxic. Don’t feed these treats to your pup, and if you should drop one on the floor, pick it up before your little guy makes a grab for it himself.