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What types can dogs be divided into based on coat characteristics?
The dog's coat is an important skin derivative that protects the dog from adverse external environmental influences and maintains a constant body temperature. The form and color of the coat are important characteristics of dog breeds, and a gorgeous coat is a second life for many toy dogs. The dog's coat consists of top hair, undercoat, and decorative hair. Top hair, also called outer hair, is the main part that constitutes the dog's coat color; it is generally long and coarse, with medullated hair making up the majority, and it mainly serves to keep the dog warm. Decorative hair refers to the hair growing on the ears, tail, and lower limbs that serves a decorative function. According to coat length, dogs are generally divided into