Thank you all. I will be calling the vet first thing Monday morning to have him come out and pull blood. While I am worried, and I agree that something is not right, I am not hysterical because George is bright and happy and eating and drinking totally normally.
Other than the strange coat anomalies, he is acting just like he has all his life. Which is to say that he treats me as his servant, who only exists to make his life completely stress free and wanting for nothing.
And I, in return, only ask that he make me laugh with his superior attitude. I love George.
Doubtful routine bloodwork (the typical CBC & general Chem panel) will show anything, except possibly mild anemia, unless there is something really serious going on. Those tests certainly won't show a copper deficiency.
Kind of late now (as his summer coat is already growing in) but it can't hurt to add a good multivitamin that contains a generous amount of copper and zinc to his diet. You should also consider flax seed (1 cup/day, preferably fresh ground) to improve the coat.
Inadequate high quality protein can also cause this. Does he get any alfalfa? If not that's another thing to consider adding. Pellets or bagged chop will due if alfalfa hay isn't available.
My 13yo Arab just started this and I too noticed when I clipped him. Looks like I splashed bleach on him. He didn't have any spots last year. He's very healthy and has been. I think it's his grey dam coming out. We always called them Bird tracks. But I guess the racehorse the name came from must have been "Birdcatcher".
Groom to trainer: "Where's the glamour? You promised me glamour!"