So, I've been researching last night, after the hit success with the angry wolf tutorial. Tonight's tut will be based on yet another canine, but this time it's man's best friend, a German Shepherd. If you'd please, you could possibly change the appearance of the snarling dog into a Pitbull. Draw the ears less fluffed and more angular to have a Pitbull face. Be sure that sketching loosely and light is highly advsised. You get much more accuracy by drawing sketchy and more confidentlly as you draw. Later down the road of success, inking and coloring your drawings would only challenge your skills. A great artist is one who practices and improves themselves. Anyways, I must move onto my other lessons. This one should replenish your temporary needs for more snarling dog heads. Thanks so much for viewing this tutorial, and let me know how you did in the long run! Peace out and have fun!