First impressions are that this is a great shot of your dog, lot's of fun.
Technically the centered composition works and the DOF is great. You've done well to expose this nicely given all that snow. As one commenter noted, a little flash would have been good as his eyes are just black voids, and it is the eyes that often makes these photos.
Artistically it's ok but that's it. This doesn't say much more than "here is a shot of my dog in the snow".
In summary an ok shot that meets the challenge. Lacks anything to make it more than "a shot of a dog doing nothing" and that is reflected in the score.
Hello whippersnapper :)
Cute pooch, nice and close, lol @ the snow on his schnozz.
Exposure's not bad but some fill in flash would help the face pop out a bit?