Okay, I washed his mane with Nizoral dandruff shampoo and used some human hair conditioner and then rinsed that out as well. It was a gorgeous sunny day, yay! I will do that a couple more times. If I just brush him on his body regularly no dandruff comes up, but if I scrub down a little he really does have dandruff everywhere. I may try that Dover product when it warms up enough to put a liquid all over. If nothing else it would make him shinier, right :) I broke down and called the vet. He said it is probably nothing, get a moisturizing product at the feed store and try that, but they could do a skin scraping, if it does not improve.