I took him to the veterinary surgeon yesterday. What a disaster! When the vet tried to examine his leg, Jake turned into a growling, biting monster, first going for me (but not biting into skin), then turning on the vet and going for his crotch! I yanked him back but not before he apparently made contact with skin (I'm not sure where and I sure didn't examine the vet). I was horrified, embarrassed, and oddly amused.
Anyway, after that, the vet decided Jake needed his other hip operated on. So in four weeks' time, Jake will be back again and we'll have another four weeks of him wearing a cone. I'm going to try to get him a Bitenot collar beforehand, and something to wear over his mouth so he doesn't bite the vet again.