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ABSTRACT. Araujo D.C.C., Antonioli T., Costa T.S., de Carvalho J.R.G., Laguna A.G.V., Ramadinha R.H.R. & Fernandes J.I. Occurrence and location of Transmissible Venereal Tumors in Dogs seen at the Universidade Federal Rural do Rio de Janeiro Veterinary Hospital: Oncology Sector between 2010 and 2014. [Ocorrência e localização do Tumor Venéreo Transmissível em cães atendidos entre 2010 e 2014 no Setor de Oncologia do Hospital Veterinário da Universidade Federal Rural do Rio de Janeiro, Brasil.] Revista Brasileira de Medicina Veterinária, 38(3):277-280, 2016. Programa de Residência em Medicina Veterinária, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, BR-465, Km 7, Seropédica, RJ 23851-970, Brasil. E-mail: firstname.lastname@example.org The Transmissible Venereal Tumor (TVT) is a round cell neoplasm mostly affecting the genital of dogs. They can affect both sexes, and most animals are sexually active. Metastases, which occur in less than 5% of cases, occur through lymphatic or hematogenous. Diagnosis can be made by cytology and the most effective treatment is chemotherapy with vincristine sulfate. This study reports the occurrence of TVT from January 2010 to December 2014 in the UFRRJ Veterinary Hospital at the Oncology sector; clinical records were reviewed: 1,522 animals were seen and 123 (8.08%) presented TVT. Of 123 animals afflicted, 71.54% were adults, 23.57% were senior and 4.87% had less than a year. A higher frequency of females (74) was observed, when compared to males (49). A higher incidence in mutts (78.05%) was found, followed by poodles (7.32%), pinscher and Labrador (3.25%). Genital location was most common (79.04%), followed by a genito-cutaneous presentation (8.94%), nasal (5.69%), cutaneous (5.69%) and ocular (0.81%). It can be linked with large quantities of stray dogs and poor animal control policies in the region.