Thank you so much for understanding. Unfortunately, I did end up losing him. We went in to have the tumor removed, and when they went to stick the tube down his throat to knock him out, they found another tumor in there, and the tube would not go in. I did supportive care for the rest of his life, and he did well right up until he just passed away in sometime between lights out, and morning. The vet said it was a virus that causes cancer that he had passed to her, and they both died of the same thing.
I was devastated, but my rescue gal that I got them from saw it differently. She was sad that they had passed, but she had learned that I would do anything for them while they were in my care, so she started working me not long after. She had a tiny little "girl" that was super flighty, and afraid of everything. This little one was not doing well with all of the bigger chickens at the rescue, so I agreed to try again (after disinfecting the crap out of everything they had touched, and most things they hadn't). After much trust building, we made friends, but I knew chickens are happier with friends of their own kind too, so I also took on two little girls that seemed to get along well enough with my Autumn. I am back in with both hands and both feet. The little girl ended up being (of course) a boy, but the two girls are actually girls, and they get along really well. They are all very sweet, and very well loved by me too. These three seem to be healthy, and my Autumn (the rooster) has grown into a very loving little man. The girls came that way, but Autumn took a little more work lol.
I still miss Buck and Tilly (the first two), but the three I have now have done a lot for healing my heart, and I am a die hard chicken fan for life now.
In all honesty, if I had known for sure how Buck would go, I probably would have gone the more humane route, but also honestly, I couldn't stand the thought of losing him. It was probably a little selfish, but in my defense, he was still eating and drinking, and seeming to me like there was a chance he would recover right up until the end. Hindsight being 20/20 I know he was telling me he didn't want to continue fighting, but I loved that little guy with all my heart, and wanted him to come around and be able to bond with another female some day (didn't know he was contagious). He did not know of this plan, and mourned Tilly so much he couldn't work up the will to live without her.
Thanks again for understanding, and it's great to know there are others like me. In rescue, when you win, there is nothing like it. When you lose, it hurts like a bugger. You keep going for the wins.