He's feeling much better now:
He's on antibiotics for some mystery infection. It appears (to me) to be respiratory because he's a little wheezy and very snotty since starting the pills. He's been sneezing and clearing out his nose nonstop. I assume this is just the virus working it's way out of his system. He only has two days left of pills (hurray! we'll ALL be relieved when it's done!). He's eating/drinking as normal.
During this ordeal, we received some new information on Murderface. He had an x-ray done, to make sure there was nothing foreign inside of him, and we learned of a couple past injuries. His right hip isn't even in the joint and his has a fractured back:
I've never had him x-rayed before- there wasn't ever a need. He's been living with us since early 2008. There's nothing to be done about the injuries now- they are very old and his bones have healed/fused how they have and that's that. This information pretty much broke our hearts. I think he must have been hit by a car before he came to live with us, when he was still an outdoor cat. When Santana was having asthma issues a few years ago, I had her x-rayed and the vet at that time saw some indicators that she may have been hit by a car as well. Both of these are pretty good cases for keeping cats indoors-only.
MF is a normal, healthy, active kitty- running and jumping around the house- but now I'm aware that he could be living with chronic pain. He's still extremely affectionate and friendly- he doesn't hide when people come over. This is something the we need to be more aware of to give him a comfortable and appropriate quality of life. I added some stairs along our bed to help him get up some years go- but I attributed that to encroaching old age. Someone in the Rav cat group recommended a heating pad for him to lay on- to help with joint pain. I actually already had one that he uses and now I realize that he goes to it when the weather drops to ease any aches/pains.
Anyway... It's sad but good to know. Murderface has known all this time and never gave overt indicators (that I've picked up on). I think now we've got to be more diligent about giving him food and treats for joint/hip health. And look for signs of arthritis in future visits to the vet.