My horse has a small but. Witch is caused by him not caring him self right when I ask him to bring hims head down with drawa reings and it gut dose not seam to help his but and someone told me that it he dose not hold him self right I could be doing more damaige that help. So how do I get him to work his back end??? And its not like I don't feed him he gets the most out of all my friend horses and its just a pain to get him butt big.she alos told me that he is troting with his front feet when he is supposed to be troting with his back feet. PLEASE HELP ME!!!!!!!!!!