For as long as people have kept historical records, we can find accounts of a strong bond between people and dogs. In primitive times when hunting was man's only way to survive, people realized that using dogs could make the hunt more successful.
This partnership was more than just people dominating animals because dogs and humans worked as partners with a goal to benefit both species.
Dogs and their human companions developed an unspoken ability to understand each other. So throughout history, when dog training was designed, it was focused on the working relationship between dogs and people.
Historians have evidence of art and documents from ancient civilizations. They discovered drawings depicting dogs serving as guides and companions as far back in time as we have records.
No doubt our ancient grandparents knew that the relationship that they had with their dogs served the people and the dogs equally and that their trusted canine companions were prized and cherished part of their families much as they are today.
It isn't a stretch to say that as long as there have been human culture and civilization, dogs have been part of it. When society was agricultural, dogs were important in protecting livestock and herding sheep and cows.
But as people began to realize how easy it was to train dogs, they began to be used in other agricultural chores as well as in military and police functions. Then dogs were bred and trained for the very purpose of serving people's working needs: Hunting, herding, protection, and pulling.