thanks, I have tried several types of food including special order $$$. The vet began each trial period with a shot of cortizone. This treament was followed with an oral dose of cortizone for ten days. Each time it looked like we had found the answer to the itching problem. Eventually I learned that it was the cortizone that provided the relief. I have been cautioned about the health risks of to much cortizone. I will not go to another vet for this problem nor will I look at how much this has cost me.
I do believe this to be food related and have since found recommendations on the internet to prepare the food myself. I now need to find a recipe.