A 5-year-old Pekingese bitch was presented with a history of vaginal bleeding and copulation before 4-week. Ovarian remnant syndrome was diagnosed on the clinical changes, vaginal cytology and exploratory laparotomy. An abdominal mass was diagnosed on radiography, ultrasonography and Computed Tomography. The remnant of ovarian tissue and an abdominal mass were removed surgically under general anesthesia. Ultrasonographic examination of the removed ovarian tissue (water bath scanning) revealed three corpora lutea. The condition resolved following surgical excision of the remaining ovarian tissue and an abdominal purulent mass.