Draw lines connecting your body and head shapes together, like this! Over your head circle, make a bell shape (this will be the wolf's cheeks), and add in lines for the legs.
Follow the V-shape lines in your head circle to put in your wolf's nose. Add ears and feet, and close up the rest of the lines around your body shapes.
Add in more fur zig-zags along the chest, belly and tail, and draw in details for the eyes, ears, nose and mouth. Make guide lines where you'll color in your wolf.
Shade your wolf along the guide lines you made in the previous step. Grey wolves are greyish-brown, with white fur on their bellies and under the chin, and black at the end of their tails.
You can add shading to the parts of the wolf which might be in shadow, like under the belly. Also add in little hairs to show the wolf's fur by drawing short lines in the direction the hair goes. You're done!