Physical Therapy for nerve damage? Dog is lame, quickly losing muscle tone?

...swimming is the way to go... you might have to build a swim-tank for the pooch...several sheets of ply-wood, deep enough to have the dog swim in a forward direction... at the head of the swim tank, a water jet set up to give the dog a swimming challenge... it's easy to build... just the water jet is "your " challenge to make it work.