I like this, the dynamics are great, wish the interaction between the two subjects was better. And I agree there is either some artifacts or over sharpening done after last resize.
I really didn't do anything but add a vignette to this, that I remember. I see what bvy is talking about, but I'm thinking that is resizing artifacts, etc. as it is not visible on the full size original.
I like this but the processing strikes me as a bit rough around the edges in places -- around the dogs eyes and ears, for instance. It clashes with all those otherwise soft textures.
I do like the capture though -- it's a good snapshot.