Hi!
What you were referring to with Canidae was a supposedly found acetaminophen by epertox. It was found not to be true because of a mix up with the way the food was delivered to epertox. It was all inconclusive. I have been feeding canidae for a year now both wet and dry. My yorkies are doing just fine on it. I do though, have to order it. I don't know about buying a 40 pound bag. I buy the smaller ones. As far as storage I suppose you could try a new or clean plastic trash can as that would hold 40 pounds of food. Something that's air tight. I'm glad your babies like it.