Pyometra's a disease of the uterus most commonly seen in female dogs (bitches), but also seen in female cats (queens), rabbits, ferrets, rats and guinea pigs. Pyometra's an important disease to be aware of for any dog owner because of the sudden nature of the disease and the deadly consequences if left untreated. It's been compared to acute appendicitis in humans, because both are essentially empyemas within an abdominal organ. Cause of pyometra Pyometra's a result of hormonal and structural cha… (More on Pyometra)