How do you use the fence during boxing?

The fence during boxing serves as a passive boundary that reduces the cow's escape options and assists the horse in containing the cow with less total movement than would be required in an open arena. By positioning the boxing work at the end of the arena, the fence behind the cow eliminates backward escape as an option and limits the cow to lateral movement, which means the horse only needs to cover left and right rather than all directions simultaneously. The fence also provides a visual reference for both horse and rider — the horse learns that when the cow is against the end fence, the job is to hold position in front of it, and that when the cow attempts to escape it is always moving toward the open arena that the horse is blocking. During training, the fence can be used more actively as a teaching tool by positioning the horse close enough to the corner that one side of the arena fence limits the cow's movement to one direction at a time, reducing the complexity of the horse's job while it is still learning. Riders use the fence angle subtly during competition boxing by positioning the horse slightly to the side that reduces the cow's easier escape route, using the geometry of the arena to make the horse's job more manageable without making the advantage obvious to the judge. The fence becomes particularly important in the transition from boxing to fence work — the decision to drive the cow down the fence initiates the fence work phase, and how that transition is managed, including using the fence corner to set up the drive, determines the quality of the fence turn that follows.