Chronic lymphopenia and neutropenia in a dog with large granular lymphocytic leukemia.

T-cell large granular lymphocytic leukemia (T-cell LGLL) is the most common presentation of chronic lymphocytic leukemia (CLL) in dogs. Aleukemic or subleukemic leukemia is a particularly rare variation in both humans and dogs, where bone marrow proliferation is either not or only sparsely translated in the peripheral blood. Neutropenia is a prominent feature in cases of human T-cell LGLL but is normally absent in canine CLL.