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Unfortunately, about 50% of tumors in the mammary glands of dogs are carcinomas (malignant) but about 86% in cats. The treatment usually starts with sugical excision of lump, and with cats removal of the entire mammary chain on the side where the lump is. Depending on size and infiltatration of the tumor into the subcutaneous tissue helps with determining prognosis. I am just giving you some general numbers, but the average survival span for cats treated surgically is 7.7 months...BUT this is based on what type and category the tumor is...and for that you need to have the tumor removed.
I would recommend starting there after a presurgical bloodwork and xrays support surgery...and then get an adjusted prognosis on your cat.