Note that a dominance or pack hierarchy will develop in a group of dogs, but that dominance or leadership refers to the relative relationship of two individuals. Whether a dog is subordinate to one dog or person, has little bearing on whether that dog is subordinate to another person or dog. Dogs have evolved from wolves, who live in groups, so they are evolutionarily prepared to live in a group. In most cases they are ready to accept a leader . You may have little control over which dog in your home becomes leader.
Most dogs work things out between themselves.
However, each owner in the family must be a leader in his or her relationship with the dog. If no leader is present, or the dog is allowed to become leader, he will assume it is okay for him to have first choice to all the critical resources , those things that dogs think are important. Such resources include food, resting places, favored possessions, mates, and territory. Dogs are naturally prepared to have a leader . Therefore, it is important that owners set themselves up as leaders very early in their relationship with their dog.