Link to site about dog allergies, some good reading.

http://www.dog.com/vet/dermatology/01.html

Great link - I'll have to check back when she discusses food allergies. My old dachshund, Max has severe allergies. We are keeping it under control with a combination new diet, herbs and acupuncture. But it's taken us 8 years to find this - 8 very frustrating years for me and for him.