Abstract: Objective To provide a evidence for the diagnosis and treatment of mammary tumors by pathological classification and description of the collected canine mammary tumors. Method The canine mammary tumors were obtained from China Agricultural University Animal hospital by surgical treatment, which were classified described according to Pathological observations. Results The benign and malignant mammary tumors were pathological described one by one, which were including the all common and uncommon canine mammary tumors. Conclusion There was greatly different pathology in different types of canine mammary tumor, so the treatment was greatly different.

Key words: Canine, Mammary tumor, Pathology