Dogs are social animals that live in a packs, and for the same reasons of survival, the presence of a pack leader is strictly necessary. In a pack there will be a maximum of two or three members with an instinct for dominance. Their hierarchy is established through fighting, possibly bloody but never deadly. The strongest will become the leader and his authority will be established. He will mount the females and guide the pack in hunting food and exploring territory. All will follow his rule until, because of age, sickness, or another reason, his place will be taken by someone else.
A dogs behavior will be identical even when joining a human family. If he has the character of a follower, he will find it perfectly normal to become a member of the family and provide for everyones needs. He will easily accept a higher hierarchy role from the family members, even the children.
If the dog has a dominant instinct, he will only accept a subordinate role if the owner is able to avoid committing any initial mistakes in communicating their authoritarian leadership. If the message is not clear, it will be the start of a daily fight to settle who is truly in command. Very often the situation is not clarified, which establishes an opportunity for the animal to take the role as pack leader.