Resumo
Little described in donkeys and of rare occurrence, fibrosarcoma is a malignant tumor of connective tissue.In this report, a 4-year-old donkey of the Pêga breed, used as a breeder, was referred to the Veterinary Hospital with a pendulum neoformation in the prepuce, according to owner with 1 month of evolution.Clinically, the animal was painfull and unconfortable when the tumor was manipulated, and the wound was ulcerated and with a focus of myiasis.An excisional biopsy was performed, and the mass was referred for histopathological examination, where the diagnosis of fibrosarcoma was obtained.Clinical aspects, diagnostic method and histopathological findings will be discussed in this case report.