I've noticed that any kibble that contains pea, pea protein seems to have a reaction on my dogs and several others I know. Earthborn has it and it caused licking, ear problems, etc...... I thought it was just my dogs, but it also happened to my friend's dogs. When I was at the pet store, the girl there asked why I was returning a bag of the new 4health grain free, and I told her it contained pea protein and my dogs were licking, etc. again. She said her dog is doing the same thing. We, including the sales girl, all went back to TOTW and the dogs are back to normal again. Ears cleared up, no licking, etc.......
My one friend had her dog allergy tested and wow it turned up so many things (including alfalfa, salmon,....). She now feeds I and Love and You. Yes, that's the name of the food at I think Petco that doesn't have anything in it that's he's allergic to.