People have hair. Cats and dogs have fur. Sheep have wool. We use wool to make yarn. The yarn is used to make clothes. We also use it for blankets. It keeps us warm.

Farmers cut the wool off the sheep. It doesn't hurt them. It's like getting your hair cut.

Wool clothes can shrink when they get wet. The wool does not shrink on the sheep. Their skin makes lanolin. It is a grease. It keeps the wool from changing size.