Cowboy David Thompson carries the reins of a horse's headstall while preparing to gather cattle near Ignacio, Colorado, on June 10, 2014. #

David Thompson walks with his dog, Fang, to catch horses that he will use for a day of gathering cattle on June 11, 2014. #

David Thompson puts a horseshoe on a horse's hoof as he prepares for a week of gathering cattle on June 9, 2014. #

Cowboys are pictured past a saddle mount, up on their horses after eating lunch on June 11, 2014. #

David Thompson works to help a horse regain its footing after it fell inside a trailer on the way to gather cattle on June 12, 2014. #

David Thompson inspects a cut on a horse's ear after it fell inside a trailer on the way to gather cattle on June 12, 2014. #

David Thompson looks back through trees as he rides his horse on June 11, 2014. #

A horse bucks as it tries to run from a saddle that had become loose during preparations to gather cattle near Ignacio, Colorado, on June 12, 2014. #

David Thompson looks down on a large herd of cattle during a week of gathering cattle on June 12, 2014. #

Cattle cool down and drink water at a man-made reservoir in the mountains on June 11, 2014. #

David Thompson removes burrs from his dog Fang that had become stuck to her fur while helping to gather cattle on June 10, 2014. #

Rancher Steve Pargin and David Thompson (R) talk with the rest of the crew during a cattle drive on June 12, 2014. #

David Thompson sits with his dog, Amelia, as she cools down after a day of gathering cattle on June 12, 2014. #

Cowboys Wyatt Williams and David Thompson restrain a calf as Stetson Mackey prepares to give it medicine on June 12, 2014. #

Cowboys Rollo Mangus (L) and David Thompson work to move a large group of calves up a trail during a week-long operation to gather cattle on June 11, 2014. #

Cowboys push a herd of cattle across Highway 160 on June 12, 2014. #

Cowboys Stetson Mackey (L), Wyatt Williams, and David Thompson (R) rest in the shade of a pine tree after lunch on June 11, 2014. #

A cow inspects David Thompson as he rests on the ground on June 11, 2014. #