Singleton pregnancy with concurrent pyometra in the contralateral horn in a bitch with a live puppy outcome.

A 20-month-old, 48-day pregnant female American Bulldog was presented for intermittent bloody vaginal discharge of 4-day duration. The bitch was clinically healthy with a mild neutrophilia. Transabdominal ultrasound revealed a viable foetus in the left uterine horn and fluid in the right uterine horn. She was treated with amoxicillin/clavulanic acid and re-examined at regular intervals to monitor for deterioration of the bitch or foetus. The uterine fluid progressively decreased in volume, and the puppy remained viable. A Caesarean section was performed on the bitch's expected due date, resulting in a healthy puppy. This is only the second published report of a pregnancy and concurrent pyometra with a live puppy outcome. This case is unique in that the bitch's pyometra resolved grossly during pregnancy.