Hey Stelth,
I think that one of the measures of our society is how we treat the elderly, the helpless and dependents, our pets. I am convinced that they offer more to us, than we to them. Thank you for your adoption and stewardship of Blue. The very fact that you thought so much of him to remember, and grieve indicates how important he was to your lives. I have struggled with this, pondering when my selfish motives to keep a beloved pet alive has crossed the line. Your pet cannot decide when to end the suffering. Sometimes the most kind action is to let go, end the problem, end the suffering. A physician has taken an oath to do no harm. With a vet it should be prolong life, not prolong suffering. I am so sorry for your loss. You did the right thing, though difficult, you are good people. Maybe in a while you will be able to give another dog a chance. Not a replacement, can never be, but a new beginning for a deserving dog.
Scott