The vet told me to try Limited Ingredient Foods for now. I tried Natural Balance with Chicken and Rice and it didn't work. It's been about 3 weeks, so I'm going to try switching within the same brand to a different protein today. She's also been on salmon and bison before (different brand) with no results.
Is this the same thing you're talking about from the vet? Is it possible she's allergic to all meats? I find that very hard to believe. There has to be something else.
Side note: Almost all the food she's been on has been grain free.
These are most of the foods she has tried:
Blue Buffalo Basics Turkey and Potato
Taste of the Wild Roasted Bison and Venison
Kirkland Grain Free Salmon & Sweet Potato
Natural Balance LID Chicken & Rice
Can get expensive, but have your tried her on Raw food? I switched my boxer to a raw food diet when she had her cancer and it did wonders for her. Not sure if it would affect the allergies, but you won't have all the additives.