FWIW: Have you ever tried to teach a horse to stand still? They will...sort of. But sooner or later they will move one foot a few inches. If not corrected, they will move two feet. If still not corrected, they will soon be walking away.
I'd look for the small things that happen before they try to blow you off by refusing. But once they flat out refuse, then this:
Originally Posted by bubba13
The first time they test me, they get whapped. Same for each subsequent "test." It doesn't take them long to decide I've passed the examination....
But in my limited experience, the 'test' starts with a 'quiz' - head tossing when putting on a bridle, putting feet down when cleaning hooves, moving in my space while grooming, etc. By the time I put a foot in the stirrup, the horses I've been around have already evaluated me. And that goes on every time I ride.