A 3 year old, female, Saint Bernard presented with a 2 1/2 week history of vaginal discharge. The discharge was initially dark and copious. Treatment by another veterinarian had slightly reduced the volume of the discharge and changed its color to pinkish. The dog was lethargic, anorectic, and was losing weight. The last heat cycle had occurred 17 months ago. At that time the dog had been artificially inseminated. It was thought that pregnancy had not been established. Physical examination revealed mild dehydration, weight loss, and a palpable mid-abdominal mass. Abnormal clinical pathology data included a leukocytosis (78,400 total white blood cell count) with a mature and immature neutrophilia (38,416 and 32,928 respectively). Abdominal radiographs were taken.