How do I train my horse for the dressage phase of combined driving?

The dressage phase of combined driving is trained through the same classical progression that produces correct movement and obedience in any driving discipline. The principles of rhythm, relaxation, contact, impulsion, straightness, and collection that classical dressage training develops apply to the driving horse as directly as to the ridden horse, and a driver who understands these principles and applies them through correct line handling will develop a horse that improves progressively through each level. The walk and trot that combined driving dressage evaluates must be genuine, forward, and rhythmically correct in both directions of the arena before specific movement figures are introduced. A horse that moves with inconsistent rhythm, pace, or contact at the working gaits will produce poor results on every figure that involves those gaits. Confirming the gaits before working on figures is the same sequential approach that effective ridden dressage training uses. Extended movements — the extended walk and extended trot that appear at most combined driving dressage levels — require the trained ability to lengthen stride genuinely rather than simply increasing pace. In driving, the collection-to-extension transition is produced through line and voice aids rather than seat and leg, but the underlying training principle is identical to ridden work. The driver's position, stillness, and effectiveness in the cart affect the horse's movement quality throughout the test. A driver who can sit quietly with elastic, independent arms and produce clear aids without extraneous movement contributes positively to the horse's performance in a way that a tense, movement-disrupting driver cannot.