a group of cattle or sheep or other domestic mammals all of the same kind that are herded by humans

guard dog (NOTE: The British term is Alsa-tian.)

any of various usually long-haired breeds of dog reared to herd and guard sheep

One who cares for and guides a group of people, as a minister or teacher, A man who herds, tends, and guards sheep in pasture; a pastor, A person who tends sheep, verb_ To watch over; to guide, watch over like a shepherd, as a teacher of her pupils, tend as a shepherd, as of sheep or goats, transitive verb_ Poetic To tend as a shepherd; to guard, herd, lead, or drive, as a shepherd, To direct or instruct in a certain manner, To guide or lead on a course