The biopsy files in dogs from the Veterinary Pathology Laboratory of the Universidade Federal de Santa Maria, RS, Brazil, from 1964 to 2003, were reviewed for skin tumors. In the 703 files, 570 (81.0%) it was reported that the dog had only one skin tumor and in 133 (19.0%), more than one tumor was described in the skin. Six hundred and fifty four (93.1%) dogs had only one histologic type of tumor and 41 (5.8%) had two tumors of different histologic types. In seven (1.0%) dogs there were three tumors of different histologic types and in one (0.1%) four histologically unrelated tumors were diagnosed, performing 761 tumors. Out of the total of 761 skin tumors found, 673 (88.4%) were neoplastic and 88 (11.6%) were non-neoplastic. The 15 more frequently found tumors, in decreasing order of frequency, were: mast cell tumor, squamous cell carcinoma, perianal adenoma, lipoma, trichoblastoma, perianal carcinoma, papilloma, follicular cysts, hemangioma, hemangiosarcoma, melanoma, sebaceous adenoma, histiocytoma, nodular sebaceous hyperplasia and fibroma.
diseases of dogs; skin diseases; skin tumors; oncology; dermatology; pathology; dermatopathology
