Tory Leather - Dog Bone Training Device Standing Attachement is a training device that helps to position the horse's head, encouraging him to give to the bit and soften at the poll. Made in the USA of quality bridle leather, this training standing attachment features a center black rubber dog bone piece, swivel snaps to attach to each side of the bit, and a snap that attaches at the girth. Havana. One size (Horse/Full). Note: Bit is not included.