I would consult a Veterinary Internal Medicine Specialist, as I said before the dog’s issues may have nothing to do with the food.
Mail-in saliva and hair tests are not helpful from what I have read. By the way, they are not cheap. I have read a lot of complaints that the test comes back positive for nearly everything. Then what? Plus, it is not an allergy test, it’s a food sensitivity test?
A book review: http://skeptvet.com/Blog/2015/06/canine-nutrigenomics-by-dr-jean-dodds-science-as-windowdressing/ Read the comments, there are a variety of opinions, pro and con.
