Great idea Cash. I love thee challenge and the opportunity this thread will provide. So I'll jump in. Have at 'er gents.
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This one is kinda interesting, as the dog has some expression going on and looks kinda..rough around the edges or something. That gives the dog some emotion/character, making it different than most other dog/pet pictures, which often are just 100% boring. You also have the background blurred out nicely.
However, there are a few big technical problems with the image. First and foremost your focus is sharp on the dog's nose, rather than it's eyes. Secondly, the dog in general is a bit underexposed, and thirdly the eyes are in deep shadows. You're shooting with a bright background, so either setting exposure for the dog's face and deal with a semi-blown out background, or using some kind of fill flash either may have been good ideas. For people as well as animals, getting the eyes right is usually key.