I'm afraid the lighting in this shot is too focused on one area and the rest of the dog is lost in shadows.
Also, your file size is a lot smaller than was allowed. It's only 37k and you could have used up to 200k for this challenge. You have probably have lost some clarity and detail to JPEG compression. Check the JPEG compression settings in your image editor and always try to save as close to the limit for a challenge as you can get it without going over.