Many horse trainers, even those who claim to follow the so-called natural horsemanship approach, take the position that horses that fail to obey a human's request are doing so as much out of perversity as ignorance. That's not Mark Rashid's view. In his words, "If we understand that horses can't separate the way they feel from the way they act, then we can start to see that unwanted behavior isn't bad behavior at all. More times than not it's...