Boycotting shows, raising awareness, enforcing the horse protection act more strictly, that kind of thing.
And just to inform you, with the proper mechanical aids a horse can preform the big lick without soring or pain. Those giant heavy shoes that they wear are actually helping them step high. At first it sounds stupid, why would you step higher if your feet are heavier? But think about it. If your feet are heavier, then you're going to work harder to get them off the ground, but once you have the upward momentum, you've got the weight going up and the extra force it took you to pick up your foot in the first place, so you naturally step higher. Put on a pair of ski boots and run, then run in normal shoes. You step higher in the ski boots wether you're trying to or not. The walking horse world has just taken this to the extreme. I don't think taking it to the extreme is much better than soring, because the horse can't be turned out in a pasture and it's like having 5 inch heels strapped to your feet but always. I just felt the need to tell you because a lot of times those documentaries are kind of one sided. I don't support the walking horse industry but I try to look at things from both sides and I hope you do the same. :)