I would have to disagree with c.cloudwalker slightly on this photograph, mind you, for my own tastes. I think the background fits well with this image. It really focuses you on the character of the dog itself. The WB looks good to me, everything is reasonably in focus, theres a lot of detail caught in his fur that i find appealing, he has a great pose (as stated by Dagwood).
The only improvements I could say are needed is to move the camera slightly down and to the right to cut him off under his paws and to show his ear, then, if possible, reflect some light on his left side so we can see his eye, (as c.cloudwalker has stated). Also, theres a little too much light on his right and it blows it out somewhat, however, it doesnt really distract very much IMO.
Overall, I think this is a successful photo.