I've heard that food allergies appear to have a genetic link (i.e. Westies), but if the dog is an outstanding specimen with beautiful hips and eyes and a clean pedigree with outstanding work ethic...who cares if it's a little intolerant of chicken? In the long run, restricting your dog's access to a certain food is a small price against breeding non-allergic animals with the potential to pass on genetic diseases. That's my two cents.