First report of diffuse cutaneous canine transmissible venereal tumor in Iran

Canine transmissible venereal tumor, also known as infectious sarcoma, venereal granuloma, transmissible lymphosarcoma, or sticker tumor, is a type of canine tumor that mainly affects the external genitalia, i.e., the vagina in bitches and the penis and prepuce in males. The tumor is usually nonmalignant, but metastasis to regional lymph nodes, spleen, liver, kidney, lung, brain, and skin has been reported in