Something to keep in mind when your dog chews chronically is that there are certain health conditions that lead a dog to chew on things like plastic or rubber, or to swallow items whole in place of palatable food. This isn‟t just a dog acting out. This is an issue that should be addressed by your vet as it can lead to poisoning or intestinal blockage. If your dog eats a coin or a rubber band once, you may be able to chalk it up as an accident. If it occurs repeatedly and cannot be curbed with sprays or training, see a vet to learn what options you have.