Max has seasonal allergies and is a little picky. He would not eat Wellness Core but is currently eating the Super 5 mix for small breeds. The super 5 has two omega oils in it that should help with allergies (per their website). Max seems to be doing better with his scratching and sniffles.
I did also add a sardine to his diet around the same time of his food switch (from Nutro). My Dad said these are good for his skin and would help with the scratching. So Max gets a sardine in olive oil daily. They are nasty but he LOVES them. Ick. Not sure if it is the sardines or the wellness but he's doing better with his scratching and eats, so it is all good.