| Summary: | The incidence of mammary gland tumors in female dogs have been studied in veterinary medicine. Thus,
the understanding of the epidemiological factors is required. In western of São Paulo region, there is a high
frequency of breast tumors, mainly malignant tumors in older animals. The aim of this study was evaluate
the data about histopathological diagnosis, breed and age in female dogs with mammary tumors presented
at the Veterinary Hospital of Universidade do Oeste Paulista during 2013 to 2015. Histopathological
examination were performed in samples of 68 animals and 64 presented malignant tumors, three benign
tumors and one non-neoplastic lesion. The mean age of female dogs was 10.7 years. The Poodle and
mixed breed dogs were more affected. The results of the present study showed a high frequency of
malignant tumors in mammary glands of old female dogs
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