dried dog food has a tremendous shelf life. You do have to worry about mold, as even the dry stuff contains quite a bit of moisture, and rancidity because of the high fat content. In general they have a "use by" date on the package, and it varies from make to make. They do pump most commercial stuff up with a lot of artificial preservatives, and the use by date is very conservative. Canned food has, in general, higher protein percentages and higher fat percentages - and a long shelf life, but is much more expensive. I have used the dried stuff up to 16 months later, with no problem. But I do store it in the basement where it's cool, but not humid.