I always hear everyone talking about grains and how animals can be allergic which some I do agree with but what about preservatives? Think it's possible for dogs to be allergic to that as well? I know some food have shelf life enouh for two years, it bothers me that maybe a food could sit this long before someone buys it. I know someone who used to work for nutro and said they once say struck load of dogfood sit in a trailer truck for over a year with no climate control what so ever before it was taken to a store to sell. That just grosses me out. What do you guys think?