Cat Urbigkit journeys alone to spend a season on Wyoming's open range, tending to a flock of domestic sheep as they give birth amid the challenges of nature, from severe weather to a wealth of predators. Her only companions are the guardian animals, big dogs and a pair of burros named Bill and Hillary, that repeatedly prove their worth in their devotion to protecting the flock. Urbigkit offers interesting reflections on the role of pastoralists around...