I'm glad you asked why. Maybe you can fill my head with more experienced thoughts :) I have a quarter horse that's so downhill it looks like he never grew out of the unproportional stage of his youth. Am wondering if just a back cinch would help him fine, or if the centerfire type of rigging would hold the saddle better on him. Posted via Mobile Device
Neither. You should look into adding breeching. You would need a stout D ring installed at the back of the saddle. You could also use a crupper. If the horse doesn't like a crupper then you will need breeching. Google mule breeching and you see what is sometimes called spider breeching.