Good news, sort of, it's not imha :) ... it is however his neck, a pinched/disc/nerve that's causing the imbalance, weakness in his hind end. He's going to be on some heavy duty painkillers and antinflammatories... the pale gums was likely not eatting and drinking, due to pain. I asked about chiropractic, but they are advising that I wait on that until these have a chance to kick in. On the other hand, the chiropractor wanted to get him in as soon as possible, sigh. My vet said that once they'd had a dog similar to ours who went right away to this woman and it did make it worse which is why we've decided to wait. It's the alternative world and the traditional world colliding I suppose. I don't want to make it worse though so I'm going with the vet ...
He must have done this, jumping up/off of his house ... so it's inside for Austin, an orthopedic dog bed, painkillers, antinflammatories, and stew :)