The domestic dog has been one of the most widely kept working and companion animals in human history.
Dogs have lived and worked with humans in so many roles that they have earned the unique nickname, "man''''''''s best friend",a phrase which is used in other languages as well. They have been bred for herding livestock, hunting ,rodent control,guarding, helping fishermen with nets, and pulling loads, in addition to their roles as companions. Dogs perform many roles for people, such as hunting, herding, protection, companionship, and, more recently, assisting handicapped individuals. Currently, there are estimated to be 400 million dogs in the world.
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