Three chapters related to skin diseases in cattle, goats and sheep of Agreste of Paraíba are described in this dissertation. The first chapter deals with the retrospective study of skin diseases in ruminants diagnosed in the Laboratory of Animal Pathology during the period from 2013 to 2017. For this purpose, necropsy and biopsy records were reviewed for a total of 2059 samples, recorded over four years of study. Information regarding age, sex, race and origin, clinical signs, epidemiological data, macroscopic and histological lesions, and definitive diagnosis were collected. The identified diseases were allocated to pre-determined categories. In four years, 72 samples corresponded to skin diseases in ruminants. Of these, 24 (33.3%) were at...