Love it...the dog looks really happy...like it almost smiling....youve got it in an action state aswell....All I would have suggested is try to get a pic like this early or late, when the sun is just rising or setting...will give it a like paradise affect...
I think: very well done. If you begin at this stage, you no longer have very far to go! Very lively scene, well framed, good light, nice dog! "Rock" is his name?
Thanks for the input, especially on sunset. Composition was helped by cropping the original. I couldn't frame my dog, who prefers keep-away to fetch, that well when he is on the run.