Hi to Joey's Mom!
I'm sorry to hear about your little pal. It is so sad to see them struggling. Once you hear that TCC diagnosis, you tend to think EVERYTHING is related to it (at least I did!) But at 16, your boy is not as young a he used to be. A long time ago, when one of my dogs could no longer easily get on the bed--I put a foot stool at the bottom and that solved that problem. Ever since it has stayed there and my dogs, young and old, have used it or not as they needed. (Sometimes when they are young, the dogs like to use it as a spring board to get better bounce and the old ones are grateful for the step up).
As for the stairs, I agree with Karen, just scoop him up and down--don't make a big deal about it and he won't be upset and you'll get two extra hugs every time you take him out.
Also, if Joey goes on Piroxicam, it's an anti inflammatory so that might make him feel a bit perkier as well.
good luck to you
Marty