Rejected for technical Issues

Nice picture, nice dog. One problem is the composition: it is too tight. You cut off the top of the dog's head. Commercial photography should not crop tightly, leave a little extra so the purchaser can crop. Similarly, while the purchaser may not need all the dog's body, cutting the pink name tag in two is not ideal. If the story is: dogs need name tags, then show it all. If the story is: dogs are free, consider removing collar and tag (while shooting in a safe and secure environment of course). The dog's nose is dirty of course; I assume this is sand. Many potential users would see this as a fault, but someone looking for that effect will love it; be sure to set subject and keywords to reflect that. When planning and posing a shot you need to think what your story is: what kind of advertiser will want to use this, to sell what?  And you should carefully review your competition, Adobe are looking for the best commercial shots, and already have almost 3 million pictures of dogs.