My Magic had cutaneous hemangiosarcoma, surgically removed, and was good for months, but started limping in mid-Dec. (this was back in 2000). Xrays showed a tumor on his femur. I took him to an oncologist, who said it was most likely the hemangiosarcoma, with a very slight chance that it was a separate osteosarcoma. He recommended amputation and chemo, and said that WITH these Magic could live another 3 months or so, maybe even longer. He actually said that's what he would do if Magic were HIS dog. Now my boy was severely arthritic.... how was he going to walk on 3 legs comfortably? Plus he was 12 years old, and not a "young" 12, either. I thought it would be cruel to subject him to all that for the sake of a few months, so I took him home, tried to control his pain, and finally let him go to the bridge a few days after the new year.
Sending hugs to Abbey and you.