I moved this thread to the "Just for Fun"-forum, as this clearly is your pet, and "Just for Fun" is for pet photography (among many other things), too.
Lyncca is very right in what she says about the underexposure on your dog proper ... the sunlit background tricked your camera into exposing for that bright part ... fill flash can help things, selective brightening in Photoshop can help things (a little), too.
He's a beautiful dog!