It may not be about finding the perfect food. What testing led you to believe that your dog has these specific food allergies?
Because, food allergies are rare. Pruritus tends to occur with environmental allergies.
For best results (if your regular vet has not been helpful) make an appointment with a veterinary dermatologist, asap. That is the only way to get an accurate diagnosis, testing and treatment options
You will get all kinds of misinformation on the internet. Use the search engine here to look up allergies, see my posts.
