Anyone have any idea what this dog could have in him? Almost looks fox-like in person. Was adopted after he was found wild. He was much darker as a puppy. 3 years old. First two are as a puppy, second two are 2-3 years old. Male. Hes changed alot. Fully grown weight 33 lbs. Very fast. Energetic when outside but sleeps most of the day. Extremely anger and protective, has bit humans and other dogs/cats. Will not eat dog food no matter what. Any help is much appreciated!