| Summary: | This paper presents the results of the study of various pathomorphological forms of breast tumors in the population of domestic cats of the Rostov region. 73247 case histories were analyzed in 8 leading veterinary clinics of Rostov-on-Don and Bataysk city, and also 30 resections of a breast were made with the subsequent histological research. The incidence of breast tumors in the population of cats of the Rostov region in 2018 was 438 animals per 100000. According to the results of 187 cytological findings, “malignant neoplasm” was diagnosed in 53% of cases (48% - carcinoma, 5% - sarcoma). The histological examination revealed malignant tumors in 80% of cases (77% - invasive nonspecific carcinoma, 3% – malignant leaf-shaped tumor). Taking into account the fact that about 1.5(±76 thousand) million cats live in the Rostov region, it can be assumed that 0.44% (p-95%, confidence interval 0.38%-0.50%) will have a breast tumor, about 80% (p-95%, confidence interval 55%-94%) of which will be malignant.
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