Composition: It seems to me that you have two subjects fighting for attention. Of course the chihuahua is the main subject but the REALLY BRIGHT sign distracts me from the dog.
Technical: The entire shot is out of focus. I think you would have been better off if you either used a tripod or a faster shutter speed and maybe overexpose it a bit.
Overall: I think this would have done much better if the shot was brighter and you got rid of the sign.
I'm not quite sure how this meets the perspective challenge. We're seeing the world from the dog's perspective? I guess that works. The reflections are a nice touch, but unofortunately there is nothing sharp enough or with a high enough impact to tie the photo together. The sign comes the closest, but it's blurred. If there was more light on the dog or something, it may have worked.