This paper describes the clinical signs, diagnosis and treatment of partial uterine prolapse of several hours duration in a horse [place and date not given]. A three-year-old Selle Francais mare was referred because of severe oedema in the partially prolapsed uterus. The prolapse existed for more than seven hours. The mare was on her 7th month of pregnancy but aborted the night before presentation. Following sedation of the horse, the uterus was cleaned, surgically treated and repositioned under caudal epidural anaesthesia. Postoperative therapy consisted of broad spectrum antibiotics, non-steroidal antiinflammatory drugs, oxytocin, infusion and uterine lavages. Echographic examination of the uterus and ovaries three and six months after therapy did not reveal any abnormalities.