The aim of the study was to estimate the prevalence and localization of different types of oral tumors in dogs and cats, in relation to sex, age and breed of animals. The study was performed on tissue specimens of oral tumors obtained during surgery from dogs and cats submitted to the Division of Pathological Anatomy, Department of Clinical Sciences at the Agricultural University of Warsaw from 1998 to 2005. During this period 122 canine oral tumors and 21 feline oral neoplasms were identified. In cats most of the tumors (76.2% of the cases) were malignant, the most common were carcinomas, rarely sarcomas and melanomas. The median age of affected cats was 9 years, most of the animals were female. In 3 cases oral tumors (two malignant) were noted in young main coon cats (average 10 months). Oral tumors in dogs were recorded in animals from 4-months to 16-years-of-age (average 9 years), more commonly in males. Malignant neoplasms were noted in 68% of the cases: melanomas, fibrosarcomas, and squamous cell carcinomas dominated. There were no marked breed predilections to the occurrence of different types of oral malignancies; however, melanomas were recognized as more common in breeds thought to be predisposed to the development of these lesions. Fibrosarcomas were more commonly observed in Dachshunds and Schnauzers than in most popular mixed breed dogs. Tumors were located on different sites of the oral cavity, especially on the gums, less commonly on the pharynegeal, tonsilar, buccal, and lingual mucosa. The least common were nonmalignant tumors: dental tumors, papillomas, and mesenchymal tumors.
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