关键词: 乳腺肿瘤； 乳腺全切术； 病理切片； 恶性

Abstract: After clinical examination，blood routine and blood biochemical examination，abdominal ultrasound and chest X ? ray examination of a 6 ? year ? old non neutered female poodle with unilateral multiple breast mass，a unilateral total mastectomy was performed for the dog，and the tumor and related lymph nodes were examined by pathological section. It was diagnosed as malignant mixed tumer. This paper summarizes this disease in order to provide some reference for the clinical diagnosis and treatment of breast tumors.

Key words: Breast tumor； Total mastectomy； Pathological section； Malignancy