When using a running martingale with a double bridle, do you put the martingale on the top or bottom rein? I don't want to use a standing martingale but want to have comfort of having a martingale there if I need it!
only ever on the snaffle rein, although i'd use a loose standing martingale instead, if the horse really needed a martingale, as there's no interference between hand and horse's mouth that way.