The skin is the horse’s largest organ and has many important tasks. Its efficient function is vital for health, as it provides protection against the environment, plays an important role in the regulation of body temperature, and carries sensory nerves for the appreciation of temperature, pressure and pain. Conveniently, the skin is the only organ that an owner can examine in its entirety and monitor on a daily basis. This is essential for early detection of problems that may be encountered. Below, is an outline of some of the more commonly-encountered skin diseases.