Source: WikipediaThe Canis lupus familiaris, commonly called dog, dog or canine, is one of the most widespread mammals on Earth.'s It's a domestic mammal usually used as a pet. It's Commonly called " man's best friend ".
It is possible that instead of that man has domesticated the dog, dogs have spontaneously domesticated themselves choosing to live near men to take advantage of the remains of their food.
Recent discoveries indicate that the dog is just a domesticated subspecies of gray wolf. According to the comparison of the genetic maps of two species, for at least 14,000 years man was able to tame wolves and is very likely that the dog was first domesticated animal, being used to help in the hunt and defend the group and its abode. Gradually, as was done and is done with other species, it was adapted to the needs of man creating different breeds for different tasks and environmental and geographical characteristics.
He quickly realized the fine senses of smell and hearing that the dog had, its smell is a thousand times more powerful than man's and his ear is able to hear sounds well below and above the range that hear the humans. This advantage increases its usefulness for hunting and guard work. Its use as a shepherd and protector of flocks arrived much later, coming together the domestication and exploitation of other animals. It's a social animal, which coexists perfectly in nested groups (sometimes extremely) and it quickly adapted to human societies.
Dogs are highly valued for their help in the hunt. Dogs buried in the cemetery in Denmark Svaerdborg Mesolithic show that in ancient Europe, was already a valuable company.