 They encourage the horse to raise its head, although they may cause slight pressure on the poll, and are therefore good for certain horses that buck and plunge with the head lowered, attempt to run away by first lowering the head, and for horses that pull, lean on the bit, or have learned to lower the head and stop to unseat the rider.Western style draw reins work similarly to the English style running rein, in that they encourage the horse to bring its head down and in.However, they may apply more leverage and because western riders rarely use the regular rein, they offer less relief to the horse.