Hi Sharyl-
Depending on where you live, the change in weather could be causing the dry skin/dander, or he is not getting proper amounts of fatty acids in his diet. You can likely continue him on Fromm Gold and add a fatty acid supplement like Grizzly Salmon Oil to his food and within a month or so will see an improvement.
Unless he is an extremely poorly bred dog with parents that showed similar symptoms at such a young age and later were diagnosed as a food allergy by elimination diet, its unlikely that he has already developed a food allergy.
Do not make the same mistake I made when my boy was a puppy and switch his foods all around. It turned out he was in fact food sensitive and by changing his food so frequently, I could not keep it under control. I also had no clue what was causing the problem. Now he can not eat a grain free diet and peas, kangaroo, duck and red meat are his worst triggers.
