Marty is home and doing well, thanks everyone for your good wishes for him! He's getting around pretty well when he needs to, but mostly just lying down. We went outside for a very short potty walk this morning. The vet fashioned a foot cup at the end of his cast, out of an empty medicine bottle, cut in half. So he goes 'tap tap tap' as he walks on it. I think pretty soon he'll put more weight on it.
Here he is, less than impressed with the situation.