One of the worst labels a dog can receive is “aggressive.”  In fact, in many states, that word can be a death sentence.  It is important for owners to understand the signs of canine aggression, and what to do in order to fix the problem. You can find some good books here on this as well. Normal Canine Behavior New pet owners may not understand that nipping, biting, and gnawing are all normal puppy and adolescent dog behaviors.  While these actions can be frustrating (and painful) they are not indicative of an aggressive dog.  Instead, this behavior stems from the fact that dogs interact with the world via their mouths (much in the same way as toddlers), and until they are taught otherwise, they will continue to behave in a way that is most natural.  Therefore, if your puppy nips at your heels, chews on your hand during play time,...