Thanks for the vibes!
Of course, the one time the vet is out here is the one time they couldn't get him to take so much as one bad step. Longeing him, palpating the joint, flexing...nothing elicited any pain or swelling. The vet told us she didn't want to take x-rays unless he was in visible discomfort. *sigh*
If it flares again, THEN we'll call her. But this has been off and on for a while. ): Maybe it's a soft tissue thing.
I have to call her back and talk with her in length, though, about what she thought about the leg unevenness. But I'll probably be getting a chiropractor out here regardless.