Curb or no curb?

”My horse likes the curb” is an argument I sometimes hear for why a rider chooses to ride with a curb bit instead of a normal snaffle. I assume that the horse in question when ridden in a snaffle can choose to pull, lean on the bit or go against the rider's hand (resistance of force), but since the horse chooses not to do this when ridden in a curb, the rider feels that the contact with the horse's mouth is lighter and smoother. But is it the horse or the rider who thrives with the curb?

Maybe it's wrong of me to say that it is the rider who likes the curb. Of course it's nice that the horse doesn't hang your hand! That is not something I want no matter what bit I choose to ride with. What I mean is that the rider may lack practical knowledge of how she could train her horse not to pull or lean on the snaffle. This knowledge exists, for instance, within the tradition of French classical riding.

I would also like to point out that whatever bit you choose, it's you as a rider who has the ultimate responsibility for the quality of the contact between your hand and the horse's mouth. Horses can, unfortunately, accept far too much pressure in the mouth with either the snaffle or curb. A curb does not guarantee that the horse does not get injuries in the mouth. We as riders should not put the responsibility on the horse to let us know what contact is OK, regardless of the bit we choose. I strive to have the weight of the rein and nothing more in my hand, what do you strive for?

Whatever bit you choose, you as a rider are responsible for:
1) training your seat and balance so that you don't use the reins for support. You should be able to follow the horse in all gaits with loose reins without holding on with your hands, or if you need to hold with a hand you should do so by holding the mane or the pommel, and not use the reins
2) training your coordination and body awareness so that you do not accidentally or without being aware of it tense or move your fingers, hands or arms, especially not backwards
3) getting yourself a decent idea of what is a proper contact.

For myself I normally choose to ride with the snaffle. The double bridle or curb are tools for precise and delicate communication that I only use on the highly schooled horse. The snaffle bit, properly used, is the most effective way to supple a horse. A supple horse has a calm and gentle activity of the mouth. He swallows, plays with and lifts the bit with his tongue. A supple horse can, in halt, walk and trot bend his neck 90 degrees. In canter the bending is slightly less. A supple horse can raise the neck and above all, he can lower his neck while extending his nose forward so that it will never be behind the vertical. This is what, in the School of Légèreté, is called neck extension.

In the end I believe it is the rider's body awareness and control, and her ideas about what is a good contact that determines which bit a horse likes.

Thanks to Mark Stanton of Horsemanship Magazine for proof reading! All remaining errors are my own.