Ellen Hoelzel
Dr Jean Dodds has recently developed a test for food sensitivities - I believe it is called Nutriscan - it is basically a chew rope toy that you interact with your dog and have your dog get some decent saliva on it - then you mail it back to them in a specially sealed tube and they will send you a report back on not specifically allergies to foods, but sensitivities - I think its pretty reasonable cost wise also.