Generally with any skin/coat issues, the first thing to check is for parasites.
As for foods, DVP VENISON & FRESH GREEN PEA FORMULA is an option. With any allergy formula, your gonna pay more though. The vet formula probably isn't much cheaper, and not nearly as good. Another to look at is Wellness Salmon formula, although its not really an allergy formula, it has no chicken.
Please please please give Maggie the steak! Its not too big for her little mouth!
Their impression of power is remarkable. They give one the feeling of immense reserves of energy, of great reservoirs of knowledge, of tolerance of disposition, obstinacy of purpose, and tenacity of principle. They are responsive, and they have a lot of quiet, good sense.
-J. Wentworth Day, from The Dog in Sport, 1938