Food Allergy Symptoms More Condition_symptoms How Long Will It Take For My Dog's Food Allergy Symptoms To Clear Up After Switching Foods?

How long will it take for my dog's food allergy symptoms to clear up after switching foods? - food allergy symptoms more condition_symptoms

To my regret, my best my dog in Bern, Purina Puppy Chow. Just when I started Weening natural balance to do so in a 3:1 ratio of Purina NB, then two and a half. From the day his eyes were very red state - to the point where I was worried for him, the development of Eye Cherry - a boy and he was very itchy. He was given a flea treatment, shortly before reaching it, so that was attributed to the early days the itching.
Natural Balance, I suddenly there every few days, and gave him a bath with oatmeal shampoo hypoallergenic. His eyes were red, itchy, as it has slightly decreased.

How long it usually takes all the symptoms of food allergy-related clarification?