Sorry to argue but the only way I am able to use EVO be it the ferret or cat variety is to have it as a very small percentage of my mix. I have many ferrets, tried for several years using it, and use a bag within 2 weeks of purchase. It is stored fine. This is a very common complaint about this food. Hence I rarely use it anymore. There are too many other good foods now out there that are grain free, high protein to put up with the issue. Nancy Park Ferretown USA Ferretown.com [Posted in FML 7075]