Jacob sheep Sheep breed The Jacob is a British breed of domestic sheep. It combines two characteristics unusual in sheep: it is piebald—dark-coloured with areas of white wool—and it is often polycerate or multi-horned. It most commonly has four horns. Wikipedia Scientific name: Ovis aries Higher classification: Sheep Rank: Breed Wool colour: piebald – black or grey with white patches Other names: Spanish Sheep Weight: Male: 54 to 82 kg (120 to 180 lb); Female: 36 to 54 kg (80 to 120 lb)