The Jacob sheep is a rare breed of piebald(white with coloured spots) multihorn sheep with between 2 and 6 horns.  Jacobs are raised for their meat, wool and hides.

They are referenced to as an unimproved or heirloom breed meaning that they have had little human selection for meat or wool specific characteristics.

Originally resembling a goat, British Jacobs tend to be larger and heavier now as there has been some selective breeding.