Abstract: In December 2018, the animal hospital of Inner Mongolia Agricultural University received a sick dog with clinical symptoms of abnormal enlargement of vulva and reddish liquid outflow in reproductive tract orifice. A tumor-like hard object in vaginal orifice was found by touch examination, which was smooth in surface with irregular shape and pale pink-colored. The initial diagnosis result was vaginal tumors. Histopathological examination after surgical resection confirmed that the hard object was immature teratoma.

Key words: canine, vaginal tumor, teratoma, surgical removal