Dogs are mammals that have been domesticated from wolves since 15,000 years ago or may have been since 100,000 years ago based on genetic evidence in the form of fossil discoveries and DNA tests. Another study reveals a dog's dogged history of domestication.
Dogs have evolved into hundreds of races with varying variations. Dog hair color can be diverse, ranging from white to black, also red, gray (often called "blue"), and brown. In addition, dogs have different types of hair. Dog hair can be straight or curly, and coarse to soft texture like woolen thread.
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