Mammary tumors are the third most common cancer in cats, with the majority malignant, making early detection and prompt treatment critical to welfare outcomes.
Feline mammary tumors cause suffering through multiple mechanisms - local tissue invasion causing pain and ulceration, systemic effects of cancer including weight loss and lethargy, and the distress of veterinary procedures including surgery and recovery. Ulcerated mammary masses cause particularly severe local pain and secondary infection. The high malignancy rate in cats means most owners face difficult decisions about aggressive treatment versus palliative care. Early detection through regular physical examination enables treatment when tumors are small and prognosis is better, substantially improving welfare outcomes. Prevention through early spaying is the most effective welfare intervention, preventing the majority of mammary tumors from developing.