Yarrow the mustang had a colorful past before coming into Sierra’s care. The two were united when Sierra chose Yarrow back in February of this year in order to compete in the Colorado Extreme Mustang Makeover. The competition involved training a wild mustang to be tame within 100 days. Yarrow certainly demonstrates how tame she is by letting Elyot, Sierra’s Australian shepard, lead her around. Apparently she also lets Elyot climb onto her back! Credit: YouTube/Sierra Hawksley