Step 20: Use the last curved line on the head as a guide to draw the Jacob sheep's fourth horn the same way. Lightly sketch the shape of the horn around the guide and only darken the lines when you get the shape right. The top horns should be similar to each other, but it's okay if they're not perfectly symmetrical. Remember to draw the wide base of the horn in toward the head a bit. Add a few lines to the sides of the base of the horn for the shape of the head.
Step 21: Use the second line from the right as a guide to draw the Jacob sheep's first front leg. Follow the path of the guide and lightly sketch the shape of the leg around it. When you get the shape of the leg right, darken the lines. As you draw the shape of the legs add a few bumps near the middle and bottom for the joints. Draw a short horizontal line at the bottom for the sheep's hoof and a vertical line to split the hoof.
Step 22: Use the line on the far right side as a guide to draw the second front leg the same way. Sketch lightly at first and only darken the lines when you get the shape right. Add the bumps for the joints. The top part of the leg should be wider than the bottom. Add the short hoof at the bottom.
Step 23: Use the line on the far left side as a guide to draw the first hind leg. As you lightly sketch the leg around the guide, bend the middle section to create the joint. The top part of the Jacob sheep's hind legs should be wider than the top part of the front legs. The whole shape of the hind leg should slope toward the left a bit.
Step 24: Use the last line under the body as a guide to draw the sheep's other hind leg the same way. The top part of this leg will be hidden by the body so only draw the visible lower portion.