Shepherds had to be outdoors in all conditions for long periods of time. They literally had to surrender a large part of their lives for the sheep in their care. Shepherds had to keep an eye out for predators, while herding the sheep away from dangerous areas. Jesus offers the same kind of dedicated love. He gives his life for each of the members of his flock.
Sheep are voracious eaters.
They consume large amounts of grass and eat right down to the roots. Because of this they must range freely over a wide area. Shepherds had to be outdoors in all conditions for long periods of time. They literally had to surrender a large part of their lives for the sheep in their care. Shepherds had to keep an eye out for predators, while herding the sheep away from dangerous areas.