Originally Posted by claireauriga
I know the curb is only used lightly and briefly, but I still wonder why it's allowed, given the principles behind riding in a snaffle ^^ It's a curious thing.
The pressure on the poll and chin that a curb provides is what puts the horse in the proper frame. Snaffles only pull straight back, which is why if you try to put a horse in a fame using a snaffle they will open their mouths, so you need a flash noseband to stop that. When you collect a horse in a snaffle you are literally asking them to "stop" and "go" at the same time. A curb makes the horse transfer their weight to the hind end and drop their head vertical, which is how they are supposed to be in dressage. It's about leverage.
My question is whether people think hauling on a snaffle bit the horse can't escape from (because of the flash) is still less harsh than using a double bridle.