High Quality Content by WIKIPEDIA articles! The Jacob sheep is a rare breed of small, piebald (colored with white spots), polycerate (multi-horned) sheep. Jacobs may have from two to six horns, but most commonly have four. The most common color is black and white, but they may also be blue and white or lilac and white in coloring. Jacobs are usually raised for their wool, meat, and hides. They are also kept as pets and ornamental animals, and have been used as guard animals to protect farm property from theft or vandalism and defend other livestock against predators.