@ctlguy I really like Diamond Naturals (delivered from chewy) . They have several different formulas and many contain chicken and/or egg so you gotta read the ingredients list. The one I really liked for a long time was the salmon skin & coat, but it contains peas and lentils so we switched to the light lamb and rice. Our beagle had been battling skin issues for a while now, and honestly, the only thing that seems to help is a continuous Rx of ketoconazole, prednisone, ear wash, and a wipe-down with hypochlorous acid every couple of days. And we have to keep socks on her front paws or she nibbles them to nubbins. 
We're so over each other rn
Editing to add: I also changed out her stainless food and water bowls to glass, and that has def helped her itchy chin and ears!
We're so over each other rnEditing to add: I also changed out her stainless food and water bowls to glass, and that has def helped her itchy chin and ears!