We took our oldest four legged family member to the vet yesterday because of a lump on his ankle. Unfortunately it was what we feared, cancer. It is bone cancer called osteosarcoma(sp). They won't take the leg as that will cause cancer growth in other parts of the body and kill him faster. All we can do is keep him comfortable with pain medications and wait until he is too sick to continue. Then we will have to put him down. He is 9 yrs old Rottweiler and has had a good life, but it is still hard to think of the day we will have to say goodbye.