Lymphoma is the most common cancer in cats. Understanding the types, treatment options, and welfare implications helps owners make informed decisions for their cats.
The welfare implications of cat lymphoma vary enormously by type. Small cell GI lymphoma, the most common form, is often a manageable chronic condition — oral chemotherapy is generally well-tolerated and cats can maintain excellent quality of life for years. High-grade lymphoma, despite treatment, is associated with shorter survival and greater treatment burden. The welfare imperative is honest information from veterinarians about realistic outcomes and treatment burden for each type. Nausea, diarrhea, and appetite changes from chemotherapy must be proactively managed. Quality-of-life assessment should be central to treatment decisions — a cat in chemotherapy who is eating well, engaging normally, and showing no signs of distress is in good welfare; one who is chronically nauseous and withdrawn is not, regardless of tumor response.