This powerful dog, with its cropped ears and strong jaw, is mostly black, but with a smattering of white around its chest and face. I think coloring this dog is an interesting and enjoyable challenge. I would start by using a warm grey to create a base color for the dog's body, then use a lighter grey to shade in and add texture. I would give the white highlights more attention, using a light beige color to show the lightest parts and a hint of yellow to make the white look more natural. Finally, I would use a subtle black to add some extra contrast, to emphasize the powerful look of the dog.