Acute myelomonocytic leukemia in a dog.

Cytochemical stains and morphologic characteristics were essential in making the correct diagnosis in a dog with acute myelomonocytic leukemia, which initially was diagnosed as lymphoblastic leukemia. Response to a treatment regimen of cytosine arabinoside, thioguanine, vincristine, and doxorubicin, besides accomplishing complete remission, helped revise the initial diagnosis to acute myelomonocytic leukemia. After remission was achieved, the dog died of a fulminating viral infection.