Here is my take on this picture. First, let me just say that he seems to be a wonderful dog.
I took the liberty of playing around your file just a bit to give you an idea of what could be done with post processing.
I cropped it into a square format, burned the surrounding, made a gaussian blur mask around the dog so that the background would be less distracting. And applied a little bit of sepia treatment to it.
Here is my result. Please if you don't like the fact that I've used your picture to show you what I had in mind, let me know and I will not do it again.
