What is the best dog food for skin allergy,and cost effective?

Vikki Nicole asked:Mylab hastheworstcase ofskin allergy,having lost fur around theeyes andpatches onhisbody. Hedoesnothaveanyform ofmange,andhasbediagnosed witha possible food allergy. Heisalready offegg products,andhasstartedvenison,butstill notmuch [...]