Sadly, this horse is not looking sound behind at all to me. I do not think it's the footing. With hind suspensory problems, I don't see how dressage even at a low level can benefit him. Not all horses need a job. Some need to be retired.
I'm sorry to say that I agree with ToN. Maybe your horse isn't ready to come back to work, or maybe he's as sound as he's ever going to be. But what I see in the video is a lame horse who's a lovely guy and trying to do what your trainer asks in spite of his lameness.
Originally Posted by Linny
Those martingales were so taut, you could play Ode to Joy on them with a comb