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Sacking out is what is done with a horse, in order to allow it to realize that what is being done to it, although scary at first, once sensitivities subside, realize that NOTHING BAD is happening to it. Sacking out is where the trainer takes a non hostile object (such as a saddle blanket or pad), and moves it all over the horses' entire body in a slow but steady fashion until the horse is no longer in objection to the object or the motion/movement of it on the horses' body.