after ruling out any physical issues, my question would be - what is your energy level while leading him? do you 'march' along with purpose or do you mosey along like you've got all day to get him from pasture to stall, etc? do you keep yourself aligned by his head/shoulder or do you walk ahead of him with the lead stretched out?
the flicking of the lead rope end towards the horse's bum is effective, but i personally would not let them stop 'to think about it' after, but give the correction (the lead rope flick) and then immediately urge them to walk on with you, repeating if necessary.
i find with my Eddie horse, if i'm being lazy leading him and walking slowly, he matches my energy level to a T, and quite often lags behind. if i act in a 'take charge and let's go this way, NOW' sort of manner, Eddie is right there with me, more energetic and quicker to respond should i change direction/stop/etc.
one exercise i do with Eddie to keep him tuned in to me when leading is to take him in the round pen or arena and just walk around with him, but not touch the lead (i drape it over his neck or just take it off the halter). i begin by standing next to him as if i was about to lead him, then i just start walking. i expect him to follow. i turn away from him, turn into him, run, stop, etc and generally make him move wherever i am moving, but without actually touching him at all. Eddie will follow me at a trot over ground poles when i jog over them, with him at liberty. it helps with me and my horse for sure.
Last edited by EdmontonHorseGal; 09-24-2013 at 06:50 PM.