So, no more tests, no more poking and prodding, and no more vets until we see symptoms and signs of pain. Right now he is not exhibiting any symptoms and acts as if nothing is wrong. Our goal will be the make sure he is happy and pain-free until the end. Even though I know this is the right decision it was still very hard for us.
On our evening walk the wise old owl who we haven't seen for weeks made an appearance as if to say, "Trust your wisdom. It is right."