My dog started itching, coughing, developed a rash and refused to eat.  I took her to the Vet who ran a bunch of blood work.  All tests came back negative and the vet put her on antibiotics.  I began feeding her cooked chicken breast, but she continued to decline and started having facial swelling to the point where I had to start giving her Benadryl and hand feeding her just to get her to eat a couple bites.  After 10 days of antibiotics, I called the Vet and told her my dog was still sick and not eating.  She wanted to do a bunch of X-rays to look for tumors or for me to "think about putting her to sleep"...I wasn't ready to do that, so I began to research and all her symptoms pointed to a food allergy (chicken is common).  I started her on the Venison and sweet potato food, now, a week later she is returning to health.  Still skinny, but no itching, coughing or swelling and loves the taste of this food.  Miracles can happen:)