To be honest, I think better a dog PTS than be too scared to behave like a normal dog. That is the only reason his methods work. He frightens dogs into submission and bullies them. Having said that, how do you know the dogs would have been PTS? A more knowledgable, kinder behaviorist/trainer could have still got good results fromt he same dogs.

I would NEVER Allow anyone to trap my dog cowering in a corner, or yank it along by it's lead. WHY do so when there is a kinder way of getting the same result? Or worse, kill it on a treadmill? (he has done this!)

As I said, anyone who is very knowldegable is dog behaviour shuns his methods. If you undertsad dog body language, watch one of his videos (plenty there) on You Tube witt he sound off, then with it on. What he says the dog is doing is very different to what it is actually doing.