My first horse didn't like carrots, not even the sugar-sodden baby carrots. He did love whole-wheat bread (like, toaster slices), which my grandmother's carrot-aholic horses won't touch with a lunge whip. My guy would maybe eat one or two carrots, then he'd start spitting them out.
I swear, he would count apple slices. When he was the only horse, I would cut the apple into quarters and feed 4 separate chunks. When my sis got her horse, and apples became a gang feed, if mine didn't get 4 pieces he started pawing the door and throwing his head. He knew he hadn't gotten his whole apple!
A stubborn horse walks behind you, an impatient one in front of you, but a noble companion walks beside you ~ Unknown