More effective than trying to fight the consequences (lowering the head and grazing) if fighting the causes (loss of attention and impulsion of movement). So, instead of trying to lift his head or stop him graze, use your body language and, if needed, your crop to make him continue moving. Also, when leading him, check his body language for any signs that he's already looking for a patch to graze and remind him, if needed, to continue moving. Don't pull or push, it will only cause more resistance. Imagine - if a horse higher in herd hierarchy is grazing and a youngster runs up to him, trying to nip and pull at his face, the horse won't be bothered or will just push the youngster aside to continue grazing. On the other hand, when a more leading horse approaches, the grazing horse will move away and start moving just from the gaze of the leading horse! The leader is the one who can make others move more. Besides, trying to get a horse away from grazing...can just focus their attention on grazing, whereas making them move gives them a new focus - to follow the leader.
Having separate sessions on groundwork may also help as it will establish your leadership, if done correctly. I've dealt with numerous horses that have this habit, including my own, and none of them try to pull this trick off on me anymore.
I have come a long way, to surrender my shadow to the shadow of my horse.
Last edited by Saranda; 12-23-2012 at 06:12 PM.