SOME ETIOPATHOGENETIC FEATURES OF MAMMARY TUMORS IN DOGS
The article presents data on the etiopathogenetic features of mammary tumors in dogs, as they allow of establishing the relationship between tumors and various causal factors, including environmental, to identify risk groups, to study the structure of pathology, its age-sexual and breed characteristics. It was found that tumors occurred in 8.9% of dogs admitted to the clinic. As to localization, the skin tumors take the first place (37,3% of all tumors). The second place - mammary tumors in females (21.7 per cent). Among the most of animals, the size of the breast tumor at its primary detection corresponded to T2-T4 stage according to the classification of TNM, and in some cases to T4a-This justifies the need for the formation of approaches to the early diagnosis of these tumors in dogs. The aim is to study the frequency and structure of cancer pathology, to study the age and sex characteristics of mammary neoplasms, the frequency of individual risk factors in dogs entering the veterinary clinic. The material for the study were all dogs admitted in 2017 to the veterinary clinic Druzhok (Khabarovsk) from January 1 till December 31 inclusive. Totally the owners of 2045 dogs visited clinic for help. Among them, 175 dogs had neoplasms (8.6%). In general, among all neoplasms, the most common are skin neoplasms-37.7%, then-mammary tumors-21.7% and gastrointestinal tract neoplasms-17.1%. The tumors in other sites in dogs were found significantly less frequently. The size of tumors detected at the age of 4 to 6 years, as a rule, did not exceed T2 according to the classification of TNM. Tumor size within T2-T4 and in some cases T4a-d prevailed in animals older than 10 years