皮膚の広範な脱毛・色素沈着と両側性潜在精巣をもち，尿中エストロジェン増加を伴う9歳のダックスフンドの腹腔内に17×15×13cmの腫瘤を認め，病理組織学的にセミノーマと診断された．腫瘤摘出後，著しい貧血が認められたが，球状赤血球および網状赤血球の出現，白血球数の増加，血小板の存在と溶血などから，免疫介在性溶血性貧血を発症したと考えられた．
―キーワード：犬，免疫介在性溶血性貧血，精巣腫瘍．

*現所属：(財)鳥取県動物臨床医学研究所（〒682-0025　鳥取県倉吉市八屋214-10）

  A 9-year-old dachshund was brought to our clinic suffering from alopecia, widely distributed pigmentation, and bilateral cryptorchidism with high concentration of urinary estrogen. A mass (17×15×13 cm) surgically resected from the abdominal cavity was submitted to histopathological examination and diagnosed as seminoma. After surgery, the dog was afflicted by serious anemia characterized by spherocytes and reticulocytes, increased leukocyte count, and the appearance of platelets and lysemia. These findings suggest that the anemia may be immune-mediated hemolytic anemia.
―Key words : dog, immune-mediated hemolytic anemia, testicular tumor.

*Present address : Animal Clinical Research Foundation, 214-10 Yatsuya, Kurayoshi 682-0025, Japan