Just back from the vet, abd Simon is a very healthy Wheaten. He said he's rarely seen auto immune or mange in a show dog and confirmed it's just seborrea.
missymohito, this will probably help you with your Wheaties scabby skin. Try an Omega 3,6 drops mixture. I just ordered this stuff online from Miami from allivet.com. It's called Homeopet Skin & Itch Relief.