From the critique club:
My first reaction to this shot is that it is too close.
You should you be further back so that parts of his face are not cut off. Right now it's hard to see what is even happening in the photo.
Your lighting seems a bit harsh. Your whites are blown out. Some of that might have been adjusted in post processing, but I find it's difficult to get back details on whites. Better to underexpose a little instead.
Basically, while this is an action shot, the subject focused on(the bone) is not really an action item, and is not so pleasing looking either. Deinitely a different angle of the dog would have improved this.
Terry
Maybe not always, but if you need a title that trys to convince your audience that your shot fits the challenge, it probably doesn't fit the challenge. I think this shot is pushing the criteria of an action shot. That aside, my natural reaction to this shot meant to represent happiness is mild disgust. The dog might be enjoying that bone greatly, but it just looks a little bit nasty to me.