The present study provides information of the incidence
and probability of developing pyometra based on age,
breed, and geographical location. The mean IR of pyometra
was about 17 cats per 10,000 CYAR with a significant breed
effect observed. The median age at diagnosis was 4 years,
and the disease was more commonly diagnosed with
increasing age. The mean case fatality rate in all cats was
5.7%. These data may be useful for designing cat breeding
programs in high-risk breeds and lays a foundation for
further studies of the genetic background of the disease.