Leaders and followers
In the dog world, you are either a leader or a follower. This pack mentality comes from the wolves that are the ancestors of today's dogs. Wolves rely on their leader for their survival. Like their wolf ancestors, today's domestic dogs are pack animals. Even if a wolf is not top dog, he is a link in the chain of command. It's the same with a dog. His instinct is to find out where he stands. Mos dogs are followers. They want to please their human pack so they can get plenty of positive attention. But dogs need a social structure with leader and a clear hierarchy. If no one takes the role of leader, your dog will fill the gap. He may display dominant behaviour such as ignoring your commands or even threatening you. Dogs look to their leader for guidance and reassurance. They expect you to be "top dog".