Well, it's good to hear Gus is doing better. I get way too emotional over pets in distress. The decision to have them put down or not is always gut wrenching and a real kick in the nuts for me to have to make.
I'm very glad Gus came in on the rebound and at least has no visible tumors on X-Ray or by scope. That had to be a relief.
Still, with his age, I definitely feel your apprehension and worries. Enjoy the time you have left with him and I pray when he does go, it's an easy passing for him and your family!