When they are born, gray foxes are dark brown in color. As adults they have a mix of white, red, black and gray fur. Their tail has a distinct black stripe along the top and a black tip. The top of the head, back, sides, and rest of the tail are gray.The belly, chest, legs and sides of the face are reddish brown.he main predators of gray foxes include bobcats, golden eagles, great-horned owls and coyotes. In the southern region of the United States, gray fox are the most important part of the diet of coyotes. Humans also kill many gray fox through hunting and trapping.