Canine Lymphoma - Circulatory System - Merck Veterinary Manual
Canine lymphoma is a cancer of malignant lymphocytes. Derived from the hematopoietic system, canine lymphoma can involve any anatomic site in which lymphocytes reside and/or traffic. Dogs with lymphoma most commonly present with enlarged, nonpainful, generalized lymphadenopathy, and when tumor burden is significant, clinical signs including lethargy, weight loss, and constitutional decline are frequently displayed.
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