Our second old man now has a medium sized lump. It's under the arm, and tighter to the body than his brother's lump, but still able to freely move. Its flat and hard vs his brother's who was diagnosed as just a benign fatty tumor which feels like a soft egg. He has his vet appointment to diagnose and schedule surgery this Friday. Is the shape and consistency indicative of it maybe being cancer? He had chronic URIs as a young guy, but has been healthy through adulthood until now. He also has a small hard lump on the back of his head behind the ear which we are pretty certain now is a tumor and not an abscess. How common are head tumors? It is not at all near the eye or jaw which is often related to cancer, so we're not sure what to think about this one.