Henry said Roxy, his ten month old female pit bull terrier, has a pink spalding ball size mass stuck in her vulva. In fact, it was vaginal hyperplasia/prolapse. Estrogens released from her ovaries during estrus induced swelling and relaxation of her vaginal tissue and the development of a prolapse. We reduced the mass, sutured the vulva lips closed and dispensed medicine to manage the swelling. Roxy needs to be spayed to prevent a return of the problem.