Try turning him away when the horses leave so he doesn’t see them leaving. If those horses he wants to follow are his pasture friends maybe try switching up the turnouts so he doesn’t get so attached.
Hope this helps
i really need help with this. i’m stressing about it so much. today, while i was riding him, he was being annoying while trotting & wouldn’t turn so i hit him with a crop and he just freaks out. my trainer always tells me to hit him with a crop, but it doesn’t seem to work. after that happened, i stopped riding and got off. i was just so frustrated. do you think he thinks he can get away with it now when i ride him? help!!!! how do i stop this?