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The skin is a pet’s natural barrier to the outside world. As one of the body’s largest organs, the skin plays many vital functions to keep pets healthy. It protects the underlying internal organs, bones and muscles, provides sensory information, and acts as part of the immune system to guard against pathogens and external threats to health and safety. As part of the skin, fur also acts as a barrier and protects the skin, maintains body temperature, and contributes to the esthetic appeal of pets.