After laying around all morning like an invalid, we managed to coax our creaky and stiff hound into the car for a visit to the vet. As soon as we got to the vet, however, Leo made a miraculous recovery and seemed perfectly normal. Typical.
He got a work-up and while they did notice that he seemed a little stiff and sore, they weren't able to find anything particularly wrong with him. He got some meds to help his joints, as well as some pain meds if his neck pain returns, but... that's it. He seems to have recovered from whatever his affliction was this morning. Who knows. I guess he's just getting older...
Anyway - I guess we're relieved it doesn't seem to be anything serious.
Thanks for the tips!