This is Mountain.
Mountain is a Diné (Navajo) or "Churro" Sheep. Here is just a brief synopsis of their history, but for those that are interested in knowing more, please check out the The Navajo Sheep Project.
They are the traditional companions of the Diné (Navajo) People of the Southwestern United States. They are renowned for their adaptability, resistance to disease, and outgoing personalities. What many do not know is that these sheep were once almost wiped off the face of the Earth, beginning first with Col. Kit Carson's campaign against the Navajo people and ending with the U.S. governments deeply questionable policies and actions during the "Stock Reduction" era. In 1972, there were less than 450 head of Navajo sheep compared to the many thousands that existed before.
Today they are rare but experiencing a resurgence and are numbered in the thousands, once again.