Well we are off to see the specialist tonight at 19:00 to see what, if anything, can be done for Five.
The good news is currently he doesn't seem to be in chronic pain. He has been outside recently, off leash, hunting, poorly, the local wild life. The best he has managed to do is be half the yard away when his intended pray flees. The only painful part for him from what I can tell is going up and down stairs. This isn't too surprising right now as his kidneys keep getting in the way when he climbs.
Five is eating less these days and having a few issues going to the bathroom. His bladder isn't suffering any at least.
Aside from that he is still acting Five-ish and all is going well for now.