As far as I know, those built up shoes are prohibited in Canada.
I rode a walker for the first time a few years ago and the breed definitely moved to the top of my 'wish list'. One day I'm going to own one!
Even though I find it extremly cruel how some of these horses get 'trained', I believe that no matter what discipline, where a lot of money is involved, you will find cruelty.
When I was young I whitnessed at a local show jumping event, how a guy put coke bottle caps under the horses polo wraps so every time the horse would touch a bar it would hurt and he'd lift his legs higher over the jumps. Yes, I've seen the bloody wraps in the trailer too...
It was quite the uproar when officials found that out and he was suspended from competing for a year.
Like I said, if you look closely, you can find cruelty everywhere; even in the 'back yard'... how many horses don't get trimmed at all (just go to an auction and you see what I mean)... it's not less stressful on their legs to walk on hooves that curl up 4" in the front than having huge shoes/built ups put on.
What bothers me more about those videos, is to see those tiny 2 year old horses being ridden by those tall guys!! It's just wrong im my eyes...