Pyometra is an infection that occurs due to hormonal changes in the uterus. Pyometra is most common in older bitches, but can occur in the young to middle aged as well. Pyometra is always a medical emergency and should not be taken lightly. Spaying is usually the best option for pyometra treatment. However, if the bitch is a valuable part of your breeding program medical treatment of pyometra may be an option. If there are any concerns that your pet may have a pyometra, please contact a veterinarian immediately.