It is not dangerous for dogs to eat apples. In fact, I give my dogs an apple whenever I eat one and they love it. Apple seeds, however, contain cyanide, which is toxic to dogs. But do not be alarmed if your dog ingests a few apple seeds or even an entire apple -- your animal would need to ingest a very large amount of seeds for it to be a danger. In general, dogs can safely consume most fruit with the exception of grapes and raisins. Though the reasons are unknown, ingestion of grapes and raisins can cause renal damage in dogs. Note though that some dogs can eat all the grapes they want and see no negative effects while others get sick. Some reports have also shown the consumption of star fruit to be problematic for dogs. If your dogs eats any of these fruits, be sure to consult your vet to be safe. Dr. Matthew Cooper, DVM

Apples are fine. Fruits are good to all living things. Just make sure that it would be a huge part of his diet.