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"If the horse tries to buck, we should press him forward with the legs and hold his head high."
"... the rider is easily displaced if the horse bucks without going forward, places his head between his fore legs, and arches his back. In this case, as the rider is not able to make the horse go forward, he should turn him to the right or left by means of the snaffle."
"A horse bucks when he changes gaits. This often occurs when training has been done too rapidly. During too rapid training, a horse can be frightened by the new sensations of the saddle when he changes from a walk to a different gait. Trying a different pad and saddle that will feel completely different to the horse may help. Once the different pad and saddle are in place, allow the horse to 'gradually' become accustomed to how they feel on his back at different gaits."