So, we are finding that Nathan is now doing best with 2 short walks and one longer walk (limited to about 1/2 mile). Overall, he's getting about 1 mile of total walking per day. This seems to keep him from having setbacks while still toning his muscles. We'll stay at this level for awhile and see how we do. One bit of good news, over the last week, he has managed to empty his bladder on the long walk a number of times. With any luck, we can get this happening on the short walks. Not sure if we'll ever get to the point where we can just run him outside to go potty.