I've seen several horses pick up weird "begging" behaviors. My boy will sometimes paw if he thinks you're taking too long with food. My sis taught her QH to "smile" for a treat, and we actually had a young calf pick it up from the horse! We never intentionally taught it to him! The cow, almost three years later, will still "smile" when he sees people coming to the fence, lol. Since cattle don't have upper teeth, it looks even funnier!