Origin of the Dog: The can, the family of animals of which the dogs, wolves, foxes and jackals descend, began to evolve first of the prehistoric mammals of about 60 million years ago. The family of the dog Canis familiaris can go back until the Miacis, a carnivorous similar climber to the weasel that lived about 50 million years ago. However, it is believed that the true predecessor is the Tomarctus, a similar animal to the fox that appeared 35 million years later.
The Tomarctus had disappeared by the middle of the Pleistocene Era, a million years ago, and today we believed that the ancestor of the dog it is the wolf, it is also believed that all the members of the Canis familiaris species descend from the wolf. Both are very sociable and they have many characteristics of behaviors in common. Towards the end of the Palaeolithic era and beginning of the Neolithic era comes the first contacts between humans and the dog, this is given to a primitive level and the first steps that they gave together are more of friendship that of domination on the part of the man, the dog was treated as a collaborator, since they helped in the hunts and guarded the man while they slept. Many behavior characteristics of the tame dog today, especially when they are with others dogs, can go back to the pack of wolves. This fact helps to explain why tame dogs respect in a good way the authority of a human owner. The owner has become the substitute of the pack leader. The dog feels sure in the subordination paper and he wants to win the leaders approval. With time, and man's progress, was able to tame other animals, such us the horse, the camel, etc.
As time went on, man continued discovering new things and the moment arrived - once he had tamed goats, pigs, rams, etc. - when man turned in to a shepherd. The dog was trained for this work, with time the wise dog knew everything and more than any shepherd could ever be, also, it had more advantage, the speed to run, his unstoppable energy, his sense of smell, also his acute ear is a great help for the realization of these task. Man has gone demanding every time more of the dog, for that reason they continue existing in great quantity and of very diverse breeds; this explains the great interest that man has always had in improving, or rather, adapting the breeds to their necessities, sometimes achieving the objectives and other times ruining some breeds that had maintained their purity during centuries.