Domestication is when an organism is trained or adapted to live with people. Domestication often changes the appearance and behavior of the organism. While dogs were the first animal to be domesticated, sheep and goats are tied for second and are the first animals to be domesticated for agricultural purposes. They were domesticated over 10,000 years ago. 
Sheep are a farm animal. They are typically very docile and are vulnerable to predators since they don't protect themselves despite being larger than some of them and males having horns.