Other creatures, such as dogs, poisonous plants, harmful substances like glass, chemicals like pesticides (which are often used in farming), diseases, parasites and humans can be harmful to sheep (Things That Are Toxic To Sheep). Humans can treat sheep unkindly, just like any other animal; however, I am mostly referring to the fact that sheep are also eaten by people. Have you ever eaten lamb before? If so, did you like it? Is anyone a vegetarian? I have, and I think it is quite tasty, especially when cooked in a curry!