A 9-year-old approximately 14-kg (30.8-lb) sexually intact female Staffordshire Bull Terrier was evaluated because of stranguria, tenesmus, and an enlarged abdomen of 6 weeks' duration and anorexia of 1 week's duration. The last estrous cycle was approximately 12 weeks prior to the evaluation. The owner had noticed a moderate quantity of cloudy, mucoid, vaginal discharge that persisted for approximately 2 weeks after estrus. The bitch had had 2 litters, the latter 5 years earlier.
Clinical and Gross Findings
On clinical examination, the abdomen was markedly distended and a small amount of clear, mucoid, vaginal discharge was noted. Abdominal palpation