To understand a dog's behavior, you must first understand that a dog is a pack animal. This Pack Mentality means that in a dog's mind you are either a leader or a follower – depending on your actions. In a dog's world, this is the natural order of life – each dog has his place in the pack.
Pack Mentality focuses on behaving as the leader commands. Dogs (Canis lupus familiaris) are wolves (Canis lupus) of many colors, shapes, and sizes. Wolves live by a very strict code of behavior, which is based on pack hierarchy. The Leader in any dog or wolf pack is considered the Alpha. The Alpha protects the pack, shelters the pack, feeds the pack, and determines how the pack reacts and behaves.