Here’s a short video of Fig practicing her head-lowering outside on a nice day. She has already learned this behavior and is now just working on duration and straightness. Teaching this behavior looks a bit different: you displace the horse’s head to the outside hip while asking them to back up. As they move that outside hip, their neck straightens and their head lowers just a touch. Voila! You capture that moment with a click and treat. Soon the rotation of the snap that predicts the displacement of the head becomes the CUE for head-lowering, like you see with Fig.