I did his stretches, walking, tail pulls, backing and walking over railroad ties again today. On his stretching and walking I'm noticing he has more reach on his right hind and is stiffer on his left hind. His left is the side that locks up so that makes sense. His backing wasn't as good today as the other day, but I did it immediately after walking and we were on the flat driveway, compared to last time it was after he'd had a break (grazing) from walking and was on grass and a slight slope. So I'm not worried that he's back sliding or anything.
Just for fun I got a video showing his walk, so you can see the overstep (or lack of) and also so you can see how I'm walking him. It's easier to show, than to explain.
He doesn't like me swinging the rope at his butt, because he'd rather be lazy, but he's a good boy and does it anyway. I will definitely continue doing all of this when I start riding again. I'm so impatient for Saturday to get here so I can see if getting trimmed makes a big difference compared to the slow progress with the PT. I'm also thinking about getting the target stick back out for our walks to see if I can get him to walk with a long stride, but with his head down more. He's developing an ugly ewe neck....
Now, I have to go to bed. It's getting late. So I'll leave you with these adorable pictures of my sweet boy.