The following tumors occurring naturally in the dog were studied pathologically and discussed briefly.
Tumors of the skin and subcutis: Fibroma, Lipoma, Epidermal cyst, Melanosarcoma, Sweat gland adenoma, Mastocytema (2 cases), Mastosarcoma, and Sebaceous gland carcinoma. Tumors of the spleen and lymph node: Fibrosarcoma of the capsule of spleen, Leiomysarcoma of the spleen, and Lymphosarcoma of the lymph node (2 cases).
Tumors of the lung: Broachogenic carcinoma (3 cases), Adenocarcinoma type, Squamous carcinoma type, and Undifferentiated (round cell) carcinoma type respectively.
Tumors of the alimentary tract and liver: Fibroma of the stomach, Hemangioma of the liver, Bile duct carcinoma, Liver cell carcinoma, and Myelogenous leukemia manifested in the liver.
Tumor of the peritoneum: Fibrosarcoma.
Tumors of the urogenital system: Fibroma of the uterus, Fibroma of the prepuce, Follicular cyst of the ovary, Transmissible venereal tumor of the vagina (6 cases), Carcinoma of the kidney, Adenoma of the prostate (2 cases), and Seminoma of the testis.
Tumors of the mammary gland: Mixed tumor (2 cases), and Myoepithelioma.
Tumor of the nervous system: Neurofibrosareoma of the thigh.
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