My dog is ready to start wheening her off her prescribed fish and potato diet of dry dog food. Do you have any ideas of what brand and type of dry food that would be best for her. She has been dealing with allergies and has been on shots for the past year. The dermatogist could not find exactly what she is allergic to regarding foods. I wastold that there is no testing that can rule this out. She has been on the fish a potato doet for 1 year. She is allergic to mold, various grasses, and leaves, etc.