I wouldn't run him if he wants to go..Like, SorrelHorse said, make him WORK but don't let him run...Make him back up, round out, flex and release, trot a little circles...
When he starts getting all jumpy make him associate it with work..
He's also probably holding his head up to get away from all of the pressure in his mouth..In the first picture you've got some serious force behind that and he just wants you out of his mouth, that's why it's open...In the second picture he has his head up because he's no associating his head up with no pressure from the bit..When a horse has their head high the least amount of control you have over the horse and the less contact you have with the bit.
It also looks like your saddle may be pinching on his withers...See how it's really tight in the front but the back is sticking up off of his back..This could be from an ill fitting saddle. Are you sure the saddle fits him?
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Last edited by DrumRunner; 02-11-2012 at 09:55 PM.