AHA provides many opportunities for you to tap into the Arabian horse lifestyle. AHA is a full-service breed association and registry for owners of Arabian, Half-Arabian and Anglo-Arabian horses. Montana Silversmiths is a proud partner of Arabian Horse Association as the “Official Corporate Sponsor of AHA.” AHA is a full-service breed association and registry for owners of Arabian, Half-Arabian and Anglo-Arabian horses. Montana Silversmiths is a proud partner of Arabian Horse Association as the “Official Corporate Sponsor of AHA.”