The diagnosis of skin disease can be difficult. The picture is often clouded by the presence of wounds, insect bites, and secondary trauma caused by rubbing and biting at the skin. History becomes important in deciding what caused the initial insult. Considerations such as age, sex, breed, change in activity or diet, contact with other animals, emotional state, exposure to skin irritants, and invironmental influences then become important determinants.
     The following tables serve as an aid in the diagnosis of skin diseases. To facilitate identification, some skin ailments are listed in more than one table.

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