I did learn with my old mare - if she didn't go with just the slightest pressure, there was generally a pretty good reason - like a mountain lion just around the corner :)
Heh... yeah... Bay's not unreasonable, so I'd hear him out if he seemed unwilling for no reason I could see. He trusted me when I told him he had to walk by that rotting pig, it's the least I can do. ;~D