Step 6: Draw a small triangle on the top, left side of the head as a guide for the Jack Russell terrier's first ear. Draw a triangle-like, angled line on the top, right side for the visible part of the dog's other ear.
Step 7: Under the circle on the right, draw two vertical lines as guides for the Jack Russell terrier's front legs. Bend the lines in the middle and at the tip to indicate where the joints and feet will be.
Step 8: Draw two more lines under the circle on the left as guides for the dog's hind legs. These lines should angle backward a lot more than the front lines.
Step 9: Connect the circles using short lines to finish the guide for the body. Add a short line on the top, left side as a guide for Jack Russell terrier's the tail.
That's it for the initial sketch! From this point on, press harder with your pencil to get a more defined sketch.