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dog (dog) {noun}

Our dog sleeps on our back porch (dinner scraps.)

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Many of the dog breeds of today were domesticated by humans in East Asia from grey wolves that lived a 100,000 years ago.

Dogs evolved through a mutually beneficial relationship with humans, sharing living space and food sources.  
There are approximately 400 known breeds of dogs in the world today. Dogs are believed to be one of the first animals to be domesticated by humans. Dogs have been breed for hunting, herding, hauling, guarding, certain looks, and obedience.  
Dogs suffer from over 400 inherieted diseases.