I can't give advice either because I'm in the same boat as you (only Ruby is having 1 leg done). She is in surgery now and I don't get to pick her up until tomorrow. My vet did not mention "therapy" but did state that she will need to stay pretty quiet and confined. She won't have a cast either because they do want her moving her leg a little.
Anyway, my prayers and happy thoughts are with you... Good luck and keep us posted.
