Glad to hear Lucy is feeling better (I just read this thread). Perhaps the food was getting rancid? That would cause more of an upset tummy than bugs would. You'd be able to tell by smelling it...smells really sour when it's gone bad. In the winter I store the dogfood in my cellar bulkhead. It's like a freezer in the winter, but summertime's a whole other problem. If it's not some place away from the cats, they'll claw the bags open! With two large dogs (and one tiny) we go through quite a bit of dry food.