Attractive tight portrait and pleasing blurred BG just right. I would suggest opening up the shadows some to reveal more detail and do a selection of the eyes and lighten them more as well as selectively sharpen them.
I would say Robert makes some fine points here. Also, might a head lift made a difference too? Either way, you came away with a very good image. Love the eyes and the stare.
I agree with the above comments regarding opening up the shadows. You wer also lucky to get a dog without a lot of scarring or torn ears, I think it must be one of last year's as it still looks a little young.