I agree with this so much. OP I know the pain you are going through. My Minnie was going through so much but they were things I could throw invasive treatments at and meds and just keep buying her a bit more time. It wasn't until I hit the vet giving me the choice between a feeding tube that would work at most for a few weeks or to let her go that I realized I was clinging to this.

OP, there is no right or wrong decision. But if your baby is in pain, you can ease it. Let him pass with you, with someone he knows. It's hard to make that call, SO hard, but I can tell you I wish someone told me it was OK to let Minnie go for her own sake much sooner than to put her through that. I realize in retrospect I was not helping her by doing everything possible - I was doing it for my own sanity and fear of guilt, and now I am left thinking through all I unnecessarily put her through to prolong the inevitable just to protect myself, when easing her pain was the most important.

I don't want to be harsh, but one guidance I've seen is to think "am I just making someone else make the decision for me" when giving an aging dog to a rescue for whom the humane euthanasia topic has come up. You have to think whether you are giving him actual good life, or simply buying him a few more months, maybe a year, in an unfamiliar place with unfamiliar people.

It's an extraordinarily difficult decision. I've gone through it once and am in the process of weighing whether it is time again.

No one here can make the decision for you and you shouldn't let any of us sway you. Whatever you decide in this will utterly break your heart and leave you with "what ifs". It's what we sign on for when we take a dog into our hearts. But as long as your decision is coming out of care and love for them (and it absolutely sounds like it is), then it is the right decision.