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There are several theories about how humans first domesticated the Grey Wolf tens of thousands of years ago but
the two most popular theories focus on how wolves might have been selected. And bred to be companion animals to humans.
Some scientists suggest that humans adopted wolf cubs that had been orphaned, hand-raising them to maturity. Then, once these tame wolves were old enough, they bred and, over many generations, become more like the dogs we know now.
Another theory focuses on wolves scavenging humans’ refuse, such as: that found at camp or hunting sites. The wolves that were less fearful of human’s might have stayed around the camp more frequently, leading to their domestication and breeding.
Archaeological digs has revealed thousands of years of humans living side-by-side with their canine companions. Over the many thousands of years between the first domesticated wolves and the dogs of today, the animals have evolved to have different qualities. Today’s dogs are smaller and have much more variation in coat color, and length. Their teeth are smaller, and many wolf-like behaviors have completely disappear. Finally, scientists have found that the cranial capacity of today’s dogs is smaller than that of ancient wolves. Because the dogs, have no need of certain elements (alertness, sensory processing) when they are bred and raised for companion animals.