Wysong has a vegan food, Evanger’s has a vegetarian canned food.
Has your dog had the skin testing to identify environmental allergies? In my experience environmental allergies are much more common that food allergies.
People often refer to food sensitivities as allergies.
If your dog was allergic, for example, to microscopic dust mites (common allergen) she would be scratching and uncomfortable no matter what you fed her.
I would consider taking her to a specialist/dermatologist, if you haven’t already.
http://www.allergydogcentral.com/2011/06/30/dog-allergy-testing-and-allergy-shots/#comment-1283
My dog is doing well, she receives immunotherapy, she now eats a variety of foods with Nutrisca (fish) as a base.
