https://farm1.static.flickr.com/105/3...ccc61cbc_o.jpg

use this as a guide, look how the face isnt smooth despite fur. There are lots of undulations because of the skull defining the shadow shapes. These are absolutely imperitive if you wanna get it right, also just for arguements sake have a look at an Alsation. These are probably the closest to a wolf in terms of shape. the shorter hair on the dog will give you an idea of the skull shape, but also look for a wolf skull online

Jay