NAVLE® Question of the day

A ten-year-old male neutered West Highland white terrier is presented with a recent history of polyuria/polydipsia, lethargy, and weight loss.

Physical exam reveals a grade 2/6 systolic heart murmur and mild muscle wasting along the lumbar spine.

Significant lab abnormalities include pancytopenia, hyperglobulinemia, hypercalcemia, and isosthenuria.

Bone marrow cytology is shown below.

What is the diagnosis?

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