Originally Posted by Northern
It's a TRUST issue-
From what has been told, this is no trust issue. Trust can only be formed when a horse has a proper relationship with a human. If the horse can go boss the person around, then why would he trust them to protect him if he is the stronger one? She has to show her dominance first and that is when the horse will trust her.
I've been in the same situation, the horse isn't scared of having his feet up, he knows they are supposed to be up and he doesn't want to. Being with a horse isn't always babying them in a calm voice, most horses just won't take you seriously then. Fear could be involved depending on where the owner is asking for the feet, but letting the horse get scared and do what he wants would be worse than having the horse knowing what he is supposed to do.
ADD: In some situations, as with my horse, they can be frightened and are still dominant so they want to leave and go to where they feel safe, so they will use their dominance. If they feel you are their leader, they won't need to go leave to where they feel safe.