I WISH I could switch flavors even weekly (have 2 bags open at a time) - Wylie will eat anything, Marcel is Mr. PickyPants. Since you only have one fella, you'll probably want to rotate 1 bag at a time (per freshness). He may not like *all* the flavors, but he might - like my Wylie. I don't use any dry, but I know some folks do.
I'm totally picturing him prancing, all proud of his new food!!!