We had a young colt a few years back that got real “mouthy” and the usual methods (crop, end of lead rope, etc.) were not working consistently. So I read about an NH solution and tried it; it worked.
I knew when we was going to get “playful” so I used a 20’ lead rope and we went for a walk. He lead pretty well 'till he decided it was time to play and it usually began with a bit of antsing and dancing then a nip. As soon as I saw the pre-nip behavior I gave him an oral correction with body language that said, “don’t.” He ignored the warnings. a As soon as he started to move his head I spun on him, did my best imitation of horse-eating monster, and ran him off to the end of that lead rope. He was visibly frightened and immediately tried to come back to me for protection. I pushed him off again, and kept him out there for two min. That two min. out in the world where any predator could get him really bothered him. When I let him back in he was very submissive. I let him relax and we continued our walk.
Like all young males, everywhere, he was a slow learner. Within a few minutes the “cutting up” started again and he ended up back at the end of that 20 foot rope, visibly frightened. He spent another two min. out there and then came back in, submissive. We walked for another 10 min. with no repeats. The next day we took another walk and when he thought about acting up all it took was a look to settle him. We had no more problems of this sort.
A slow learner? Yes. But that just implies that some learning is taking place; and it was.
Didn’t have to smack, stick him, or inflict any physical pain at all. I just exiled from from the herd and he got the message loud and clear.
This might not work with every horse. But it did work with this one.
G.