Granulosa cell tumor in an ovariohysterectomized dog.

A granulosa cell tumor was found in a dog with clinical signs of persistent estrus that began 6 years after ovariohysterectomy had been performed. The tumor was diagnosed by use of ultrasonography, provocative testing with human chorionic gonadotropin, and exploratory laparotomy. Hyperestrogenism from functional tumor cells caused bone marrow suppression and endocrine alopecia. Successful treatment included tumor removal, blood transfusions, and antibiotic administration.