Description: A female 4-month-old Pug dog was referred to the Small Animal Clinic of the Faculty of Veterinary Medicine, Trakia University, Stara Zagora with a history of difficult and painful urination, reddening and swelling of external genitalia since one month of age. The owner had noticed the anomaly several days after the birth of the puppy, but had not sought medical advice as there were no signs of discomfort. The physical examination did not reveal any deviations from the normal state. The inspection of external genitalia showed an incomplete occlusion of the skin between the dorsal commissure of the vulva and the anus, exposing directly the swollen and hyperaemic vaginal vestibule and clitoris. The diagnosis of congenital incomplete closure of the anogenital space (anogenital cleft) was made and surgical repair of the anomaly was performed. The anomaly was corrected surgically by creating a dorsal vestibular wall by means of inverted V-shaped perineoplasty. An inverted V-shaped incision was made on the skin between the anus and dorsal commissure of the vulva, followed by removal of the tissue between the vestibular mucosa and the skin edge. The wall of the vaginal vestibule was closed by interrupted absorbable 2-0 polyglycolic acid sutures and the skin - with interrupted non-absorbable sutures. The outcome of the operation was excellent, without any postoperative complications or other genital defects. The follow-up examination performed 5 month later showed a normal position of the external genitalia and the anogenital space