My dog has been on Annamaet Grain Free (chicken is protein) for almost 4 months, but he is having signs of allergies (scratching, ear infections, etc). We have been feeding him other types of treats (chicken jerky and freeze dried beef liver) and just recently gave him some salmon in his food. I have no idea what is causing allergies so I'm going to start from SCRATCH and only use one protein. I'm assuming beef is out (he will throw up if I give him beef liver on an empty stomach) but wondering if the chicken is also a problem? I was going to start with Annamaet salmon formula - seems like that would be the least likely allergen out of the proteins I can pick from? Any advice?