My horse bites when I saddle it — why does it do this and how do I stop it?

A horse that bites or snaps when being saddled is almost always communicating pain or anticipation of discomfort, and treating it as a manners problem without investigating the physical cause first is a mistake that will make the behavior worse. The most common physical causes are back soreness, girth or cinch sensitivity, saddle fit issues that create pressure points, and gastric ulcers — which frequently produce sensitivity in the girth region that causes horses to cow-kick, pin ears, and bite when girthed. Before applying any behavioral correction, have the saddle fit evaluated by a qualified fitter and have the horse examined by a veterinarian, particularly if the behavior is new or has escalated. If a thorough evaluation rules out pain, the biting behavior has become a conditioned habit — the horse learned early that biting or threatening to bite caused handlers to pause or back away, and the behavior was reinforced through repetition. The correction for a confirmed habit biter requires that the behavior produce no reward: do not stop, back away, or react with alarm when the horse threatens. Continue the task calmly and ignore the threat entirely while simultaneously making the threat physically impossible by positioning the horse's head away from you with the lead rope tied or held short. Some handlers use a wall to prevent the horse from turning its head toward them during saddling. Never reach toward the horse's head to correct a bite mid-task — that is exactly the response the horse is seeking and it rewards the behavior. Address the habit consistently over time while keeping pain ruled out as a concurrent possibility.