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When people call hairy animals furry. Although hair and fur are physically the same---made up of keratins and other proteinaceous molecules, an animal is said to have hair when each follicle in the skin produces only 1 grain of hair. An animal is said to be furry when each follicle produces more than one grain of hair at the same time. Therefore, a cat is furry and a dog is hairy. Wolves are the genetic ancestors of dogs and are hence, hairy.
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