The prescription for NSAIDs was 5 years out of date. They got him an appointment with the vet. By the time of the vet visit, he wasn't putting any weight at all on the leg hardly. I drove him there, since they were still about an hour out. They met me there after the initial vet look-over. There will be x-rays and bloodwork. It could be as innocent and straightforward as an arthritis flare-up (he's 12, with a history in other joints) or it could be ... a number of things, including possibly a bone tumor. Crossing my fingers. He's a good old dog.
When I saw the direction things were headed with his mobility, I stuffed a small handful of kibble in my pocket. My aunt uses that trick: set aside a portion of kibble from the next meal (or reserve it from the previous meal) and dole it out as rewards and bribes (and general treats for being a good sport). This was the first time I'd done that with him, and he got a lot lickier with me than usual. M. laughed a bit and said no wonder he liked me so much. I have good role models!