Dog

From Tardis Wiki, the free Doctor Who reference

The dog is small mammal in the order Carnivora native to Earth. Dogs were domesticated from wolves relatively recently by the humans. Over time, the dog has developed into hundreds of breeds with a great degree of variation. For example, heights at the withers range from just a few inches to roughly three feet, and colours range from white to black, with reds, grays, and browns occurring in a tremendous variation of patterns. Dogs, like humans, are highly social creatures, which accounts for their trainability, playfulness and ability to fit into human households.

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Dog