It's not unknown for dogs and coyotes to breed. Could have been a cross breed(known as "Coydogs"). It could have also been a very dark colored coyote too. I have seen them from a very dark charcoal gray(black from a short distance) to a reddish color. An uncle of mine shot one years ago that was almost totally white(not an albino) that was only a few years old. You may have passed on a unusual trophy. Lawdog
