An adult female Collie with anorexia, lethargy, posterior limb ataxia, and enterorrhagia had severe leukemia. In the peripheral blood were granulocytes, monocytes and cells with characteristics of both (myelomonocytic intermediates). The dog died within 17 days of the onset of illness. There were widely disseminated green-yellow foci of leukocytes of the same types as in the peripheral blood. A diagnosis of acute myelomonocytic leukemia was made.
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