I agree that chicken would be good to start with also. Are you feeding any supplements? Those can cause allergies too depending on what is in them. I would be careful with treats also.
Rusti EAC, TN-N, TG-O, WV-N, NCC, NJC, CGC, GSD Diva
Jerry Lee AXP, MJP, OAC, TN-N, WV-N, NCC, NJC, SPJ, UAG1