Wet ground also poses a threat. It must be fertile and productive but not swampy. If the sheep spend too much time in wet terrain, they can develop foot rot or dangerous abscesses under the hooves. Most diseases that afflict sheep are highly contagious. Parasites, infection, and other ailments spread quickly from sheep to sheep, making it urgent that the shepherd be on guard at all times so that he can diagnose and deal with the sheep's infirmities before an epidemic ravages the flock.
Shepherds are Protectors Sheep are almost entirely defenseless.
They can't kick, scratch, bite, jump, or run. They need a protective shepherd to be assured of survival. When attacked by a predator, they huddle together rather than running away. That makes them easy prey. If a full-wooled sheep falls on its back, often it is unable to roll back onto its feet.