Step 15: Use the initial circle and arc as guides to draw the rest of the bull terrier's head. Darken the outer edges of the initial circle and arc to create the shape of the head. The top of the head should lead into the shape of the dog's muzzle to form a curved, egg-like shape. Near the bottom of the circle, draw a small, curved line to emphasize the jaw.
Step 16: Use the second line from the right as a guide to draw the bull terrier's first front leg. Follow the path of the guide and lightly sketch the shape of the dog's leg around it. Make the top part wide and gradually thinner at the bottom. The foot bends forward at the bottom. Sketch lightly at first so that it's easy to erase if you make a mistake. When you get the leg right, darken the lines. Keep the edges of the leg close to the guideline so that the shape isn't too thick. At the bottom, draw a couple of short lines for the dog's toes. At the tip of each toe, draw a small triangular nail.
Step 17: Use the line on the right as a guide to draw the dog's other leg the same way. Lightly sketch the leg around the guide. Darken the lines when you get the shape right. Bend the bottom of the shape forward for the foot. Add the toes using curved lines and the nails using triangular shapes.
Step 18: Use the angled line on the far left as a guide to draw the dog's first hind leg. Draw this leg the same way. Follow the path of the guide and lightly sketch the leg around it. Bend the leg near the middle to indicate the joint. The top part should be very wide. The leg should slope to the left at the top. When you get the shape right, darken the lines. At the bottom, draw a few of curved lines for the bull terrier's toes. Then draw a couple of tiny triangles for the nails.
Step 19: Use the line to the right as a guide to draw the bull terrier's other hind leg the same way. A big part of the top of the leg will be hidden by the first leg, so just draw the bottom visible part.