[Kimblee is similarly-minded, in that regard; he's always been quite the believer in leading the horse to water, as it were.]

Of course it doesn't justify any unwilling pain and suffering, but that's hardly the case here, is it? If they're doing so repeatedly, because they want to, and there are no adverse long-term affects, I don't believe that constitutes abuse on the part of the trainer - at which point it does become a matter of what that trainer is comfortable with, yes, but there's no point in trying to dress up one's own personal discomfort as concern for another's well-being.