sentence: Dogs eat both meat and vegetables, often mixed together and sold in stores as dog food.
sentences_before: It has been domesticated by humans for a long time. It was the first animal ever to be domesticated. Dogs are used by humans for many different things, for work and as pets. They are a popular pet because they are usually playful, friendly, and listen to humans. Thirty million dogs in the United States are registered as pets.
sentences_after: Dogs often have jobs, including as police dogs, army dogs, seeing eye dogs, fire dogs, messenger dogs, hunting dogs and sheepdogs.
concept_name: dog
headings: Dog
categories: Dogs