[The age and stage of estrus in bitches with pyometra. Statistical inquiry and interpretive study of the understanding of variability].

Using anamnestic data, pyometra in the bitch is shown to be particularly a disease of the older bitch in the metestral phase of cycle. Most of the patients are presented during the first four weeks after their last heat. In individual cases the disease may occur in any other stage of the cycle. The occurrence of pyometra in young bitches is discussed. An attempt is undertaken to show the pyometra endometritis complex and glandular cystic hyperplasia of the endometrium to be a similar response to different disturbances of the cycle regulation in dogs.