Why is it important to be careful when dismounting during the first few rides on a green horse?

Dismounting from a green horse in the early rides deserves as much deliberate preparation and care as mounting, yet it is an aspect of starting young horses that riders frequently overlook. The assumption is that if the horse accepted mounting and the ride went well, dismounting is simply the reverse of the same process and carries the same low risk. In practice, dismounting introduces a set of novel sensations and visual stimuli that a green horse has not encountered before, and the moment the rider swings a leg over to step off is one of the most vulnerable positions in all of equine handling — one foot in the stirrup, weight committed, and no ability to respond quickly if the horse moves. The first novel element of dismounting is the sight and movement of the rider's leg swinging back over the horse's hindquarters on the off side. For most green horses, the earliest work under saddle has established the rider's presence above and to the front and sides, but a leg appearing and swinging down over the hindquarters is something the horse's peripheral vision catches as new, unexpected movement close to a sensitive area. Horses that are spooky, hindquarter-sensitive, or simply surprised by this visual stimulus can leap forward, spin, or kick out at exactly the moment the rider has the least control. Preparing the horse for this by rubbing and desensitizing the hindquarters thoroughly during ground work — and by practicing swinging the leg back over the saddle while still mounted and stationary before the actual dismount — removes much of this surprise. The second critical moment is when the rider pushes off and slides down the horse's side, which shifts the saddle laterally and creates the same asymmetrical pressure as mounting but in reverse, accompanied by the visual stimulus of the rider's body descending alongside the horse's shoulder. A horse that has been desensitized to the trainer standing in the stirrup and lying across the saddle on both sides will be more accepting of this descent, but even a well-prepared horse can be startled by the speed of a full dismount if it happens faster than his processing speed allows. The sound of the rider's feet hitting the ground is a third factor that many riders never consider. A confident, full dismount produces a distinct thud when feet strike the footing, and for a green horse that is still in a heightened state of awareness, an unexpected sound directly beside him can trigger a spook or a jump forward. Landing softly, distributing the landing over a slight bend of the knees, and pausing briefly with one hand on the saddle after landing gives the horse a moment to register that the movement has stopped and that nothing threatening has occurred. The practical approach for early dismounts is to do them slowly and deliberately, with an assistant holding the horse if one is available. Slide the right foot out of the stirrup first, pause while maintaining left foot contact, then swing the right leg slowly and deliberately back over the hindquarters rather than kicking through in a hurry. Lower the body alongside the horse with control rather than dropping, and keep the left foot in the stirrup until close enough to the ground that the final step down is minimal. Practice this slow, controlled dismount consistently in the first several rides, and the horse quickly learns that the sequence of sensations associated with dismounting is predictable and harmless — which makes him progressively safer to dismount as his experience accumulates.