Melatonin supplements work for some dogs.

http://www.nutriscan.org/

Would DEFINITELY do this to start with....I have had wonderful results with this test.

Hey Barb,
My co-worker adopted an Eng. Bullodg from a friend, and she had awful skin problems when she first arrived. Nothing really worked and she was constantly being put on steroids. I was thinking thyroid, but she tested normal. Then she started having petit mal seizures. I finally convinced him to send her blood to Dr. Jean Dodds, and she tested low normal thyroid, and put on supplements.
Lo and behold, her skin cleared up and better yet so did her seizures.
They've already spent $$$$, it might be worth it if it ends the cycle.
Sarita

If the dog has been to a dermatologist, what allergies were diagnosed?