Some stores will take the Fromm's back (and give a refund) if you have a receipt and more than half the bag left. You could also donate the rest of the Fromm's to a rescue in your area or a pet food pantry or spca. I know when transiting food we should do it over time but if your pup isn't going to eat it and it makes him itch why force the issue IMHO. If your pup loves the Acana, I say go with it and ditch the Fromm's.
Ziva GSD 3/7/13
At the Bridge: