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Orijen Freeze Dried Adult Dog Food 454g Our Biologically Appropriate? ORIJEN freeze-dried foods are prepared without cooking, so they retain all of the natural goodness of our authentically fresh ingredients. Our freeze-dry kitchens are equipped with nitrogen tunnels which flash-freeze our fresh ingredients at extremely low temperatures (-60?F), locking in their life-giving nutrients. Then during an 18-hour freeze-drying process, the water frozen in the ingredients is gently converted into ice vapor, without creating any liquid. This means only water is removed from our fresh ingredients, leaving behind all of their richly nourishing goodness in concentrated form, creating a nourishing taste experience your dog will love.