Step 20: Use the last line under the body as a guide to draw the other hind leg the same way. Use short strokes to draw the furry shape of the leg around the guide. Add the schnauzer's toes and nails at the bottom.
Step 21: Use the remaining lines and shapes as guides to draw the rest of the dog's body. Draw a series of short strokes along the outer edges of the guides to create the furry shape of the body. Use slightly longer strokes along the underside of the body for the hanging fur found there. The longer you make the strokes, the shaggier the schnauzer's fur will be. Draw short strokes around the small line on the top, left side for the tail.
Step 22: For a cleaner look, erase as much as you can of the initial guide lines. Don't worry about erasing all of the guides. It's okay to leave some behind. Re-draw any final sketch lines you may have accidentally erased.
Final Step: Add some shading to your schnauzer drawing for extra detail. Use a dark value for the nose but leave a thin strip at the top blank for highlight. Use a dark value for the area around the eyes and the top part of the muzzle. Use a medium value for the rest of the head but use a very light value the brows, mustache and beard. Vary the pressure on your pencil to get different degrees of tonal value. For a more detailed guide on how to shade, check out this tutorial: How to shade.
Use a medium value for the schnauzer's body too. Use strokes that go in the general direction of the fur. Leave the legs and chest blank. Separate each individual stroke a bit so that the white of the paper comes through. It's a good idea to use reference as you draw for an accurate depiction of a schnauzer. If you have a pet schnauzer or a similar dog breed, try to duplicate it's fur on your drawing. Using a light value, add some shadows to the white areas of the body to give the figure more volume.
Add a cast shadow underneath to ground the dog so that it doesn't appear to be floating. Shading can be time-consuming, so be patient and take breaks. Don't forget to pause the video after each step to draw at your own pace.