Hi SS,
I have been through this before. It does suck, however, my dog recovered quickly after surgery and went through chemotherapy. I was exceptionally concerned that he would suffer through all this yet he was bouncing around three days after the surgery and the chemo treatments didn't take anything out of him at all. He actually loved going to the hospital, couldn't wait to get out of the car and in the door because they were so nice to him. Despite my reservations, my dog was no different, seemed to be in no pain, and he did have an entire extra year of life full of running, playing fetch, and being himself. When he relapsed we were told we'd know when the time would come because he would be in visible pain and wouldn't eat. He managed about three months after the relapse, again, with no visible problem at all. Then, one day, he seemed a bit stiff and had no energy, the next day he stopped eating, and that's when we called the vet. In the end, every penny I spent was worth it and when I looked at him that last day, I knew, I don't know how, I just knew that it was time for him to move on. He had a good fight and he had such a great time in that extra year, that I don't regret anything.
The first thing I suggest is seeing a canine oncologist at the nearest animal medical center. A second opinion is always a good idea with such a dire diagnosis. If you get the same response, and you may well not, give the homeopathic medicines a try. It's worth the shot.
After that, follow your conscience. I suggest ignoring what everyone else says about euthanasia now, later, or never. That decision, and any opinions on it, are the province of you, your dog's vet, and the dog. Always do what you think is best so that such a major decision doesn't haunt you the rest of your life.
I now have two great dogs whom I love very much. Celebrate the quality of life you have now.
