How do you teach a horse to open a gate?

Teaching a horse to work a gate is one of the most complex obstacle skills because it combines several independently trained responses — sidepassing, moving the shoulder, moving the hip, stopping, backing, and standing quietly — into a coordinated sequence performed alongside a moving object that may make noise or apply unexpected pressure to the horse. Each of those component responses must be confirmed before the gate is introduced as the context for combining them, because the gate itself adds enough complexity and potential for confusion that trying to install the component skills and the gate sequence simultaneously rarely works cleanly. Begin with a gate that swings easily and quietly without requiring the horse to push against significant resistance — a well-maintained gate in good repair is easier to train on than a stiff or heavy one that requires effort to move. From the ground, lead the horse to the gate and allow it to investigate, then practice positioning the horse parallel to the gate at an appropriate distance without any opening or closing happening — just the horse standing quietly alongside the gate and tolerating the handler working the latch and opening it slightly. Under saddle, the gate approach begins with positioning the horse parallel to the gate on the appropriate side, latching and unlatching without the horse moving, then opening the gate while asking the horse to stand and then move through it in the appropriate direction using sidepass, forward, or backing as the gate configuration requires. The horse that has genuinely confirmed component responses will piece the gate sequence together relatively quickly; the horse that is missing any component will show that gap clearly when the gate combines all of them, and the training response is to return to that specific component rather than continuing to attempt the full gate.