It all depends on where they are located and how serious they are. I believe that question would have to be given to a vet who has seen them. My dog had a tumor on her for years. It was located in a place where it wouldn't be wise to have surgery done and it was harmless. It was just ugly as it grew. But, we didn't care how ugly it was cuz we loved our lab.what do you all do about your older pets tumors? Leave them alone or have the vet surgically remove them?