We believe in feeding our pets only what they actually need in their bodies. Since they don’t need preservatives, we don’t use any. So, think of the prepared pet treat products --- thumbprint cookies for dogs or botanical bark for cats --- like fresh bakery pastries. We know both you and your pets don’t like to eat moldy treats, so we suggest following our tried-and-true storage tips. See BAKING MIX HOW-TO for guidance on storing the prepared vegan baked goodies.