A little insight: I don’t see black his coat at all. What may appear to you to be black or gray, isn’t. I don’t use even a tiny amount of black oil paint in any of my pet paintings, and haven’t in years. The most natural darks aren’t really black at all in natural light with natural shadows. I was talking to a friend of mine the other day (who is colorblind, go figure), and had a hard time convincing her that clouds aren’t really white, and snow is blue. Now I’ve put her whole color wheel out of whack.
I learned this from Johannes Vermeer. He never painted with black (aka mars black) at all. I believe this is why my pet portraits are always so vivid and lifelike. There’s very little white, and absolutely no black.
Have a look around you today, and really look at the colors of what you’re seeing. I think you’ll be surprised at what you see.