So we went trail riding yesterday in a park where everything was truck size dirt roads. Needless to say we cantered a lot. It's been awhile since we ran the horses in an area where we could be side by side, so I wasn't anticipating my horse being a goof about it. If we were on the left, he would bulge out his right side as if to block the other horse. I thought maybe he was being spooky about something in the woods, so I switched sides and he did it the other way. He raced for 3 years before I got him, so I know he has that whole competitive thing in. Problem was he had no interest in getting ahead. He just wanted to be a butt to other horse. I ended up cantering him practically in shoulder-in to keep him "straight". Has anyone's horse done this? He's always got something new up his sleeve.