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The dog is a domesticated subspecies of the gray wolf, a mammal of the Canidae family of the order Carnivora. The term encompasses both feral and pet varieties and is also sometimes used to describe wild canids of other subspecies or species. The domestic dog has been one of the most widely kept working and companion animals in human history, as well as being a food source in some cultures. There are estimated to be 400 million dogs in the world.

Dogs are highly social animals. This can account for their trainability, playfulness, and ability to fit into human households and social situations.

From Wikipedia, the free encyclopedia