I can't belive that a horse trained with Parelli would do that. It was probably the girl's fault(not to be mean!) Parelli is all about teaching the human, not the horse.
This is the same horse that would try to mount people, chase them down and "play" with them, etc.
And yes I agree that Parelli teaches the human. Teaches the human to pay a lot of money for cheap trick training.
Really Parelli is like a brand-name for horsemanship, I personally prefer the cheap Walmart stuff, but if you think paying thousands of dollars more makes it any better then go ahead.
Anyways - clipping ears. I don't think they should get clipped out anyways, just trimming the excess hair is nice, but actually clipping all of it out just lets bugs in..