We have been down the allergy road as well. Tons of money spent on unreliable food allergy testing and environmental allergy testing only gave us useless and unreliable information. When I took Daisy to a veterinary dermatologist, I started getting answers. Fortunately, our dog is able to stay on Neoral (atopica) and do very well without even having to go to maximum dose.
My suggestion is to heed the advice you are hearing - get to a dermatologist. He or she will recommend a diet and any medications that may be used. In our case, I spent years changing this protein or that carbohydrate and going nuts to be honest -- only to learn that food allergy testing in dogs is unreliable and basically useless. It's been a couple of years for us so maybe the testing has changed but I'd avoid doing anything more until you have an expert guiding the process.
Good luck!
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