Dang! I wrote a comment and it disappeared! Darn SERVER!!!
Anyway, see if I can remember most of it here. I love the candid shot but there are a few distractions here. The orange collar really wants to draw me to that side of the shot, great for seeing your dog at night or for others to see him but bad of pictures. The color of the dog is a bit flat, maybe a slight adjustment in levels or curves and the backdrop could be more solid or maybe just a different angle so it doesn't come out at his nose, LOL :) A 5
(hope it takes this time, highlighting and Copying just in case :) )