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The domestic dog is a mammal in the canine family of the Order Carnivora. Based on genetic evidence, dogs began from a single domestication of a now-extinct wolf-like canid in Western Europe 27 to 40 thousand years ago. Since this time, the dog has developed into hundreds of breeds with a great degree of variation in height and weight, coat color and texture, anatomical details and behavior. Dogs fill a variety of roles in human society and are often trained as working dogs. For dogs that do not have traditional jobs, a wide range of dog sports provide the opportunity to exhibit their natural skills. In many countries the most common, and perhaps most important, role of dogs is as companions. Dogs have lived with and worked with humans in so many roles that their loyalty has earned them the sobriquet "man's best friend."