Horse Psychology What Would Cause A Horse To Trample Someone?

What would cause a horse to trample someone? - horse psychology

I attended the Clinton Anderson Clinic today and bought the horse said that the oppressed people and has been known to bite ... I began to think and read many books on the psychology of the horse, etc., and none of them ever talked about what causes a horse trampling on someone. Everyone has to know what causes a horse?

Thank you.