A sheep dog is guarding a flock of sheep. Sheep are commonly kept as livestock.

Livestock are domestic animals that are kept by people. Their uses are for meat, milking, wool, leather, or labor. Taking care of livestock is animal husbandry. Some types of livestock are: cattle, pigs, sheep, goats, and chickens. Chickens produce eggs; pigs produce meat; cattle, goats and sheep create milk, and sheep also create wool.Horses, cattle, camels, llamas, water buffalo, and other large animals do work for people, such as pulling wagons and other vehicles.