An about 8-year-old male Shetland sheepdog showed vomiting, salivation, listlessness, anorexia, decending abdominal skin with depilation, pigmentation, swelling breast and nipple, continuous bloody stool and cryptorchism. Thorombocytopenia and prolonged blood coagulation time were obserbed, and two fist-sized masses were detected in the peritoneal cavity by palpation and X-ray. During operation to remove the peritoneal masses, there was considerable local bleeding, and hemorrhagic spots were seen in the colon, and the mesentery. After operation, the dog was anemic continuously excreting bloody stool, and died in 15 days. Pathological diagnosis was Sertoli cell tumor with seminoma.
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