This general information about Jacob sheep was provided by the Jacob Sheep Breeders Association. The Jacob is a small to medium size breed. Adult ewes range from 80 to 140 pounds, while rams will occasionally obtain weights approaching 200 pounds.
Coloring is basically white with black or lilac spots randomly distributed on the body.
Ram horns can reach 30 inches or more. The fleeces from Jacobs are a delight for handspinners and for the connoisseur of natural color. They are light and open, weighing between 3 and 6 pounds and having a stable length of 4 to 7 inches. They part easily, exposing a soft, medium wool with healthy luster and sheen. The average micron size is 34 and ranges on the Bradford scale from 48 to 54.