Wall-e is no longer lame; woohoo! As of Saturday, he is no longer putting his weight on his right leg, and yesterday he wasn't limping either. We have a vet appointment on Wednesday, so we'll see if our veterinarian sees anything. I've increased his exercise to a daily 30-minute walk.
I've also started training him regularly again. This morning we worked on lefts and rights. He always gets his lefts, but his rights are still at about 50%. Still, he was really enthusiastic, spinning like a top!