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Additives and preservatives are included in commercial processed pet foods to prevent spoilage, extend shelf life, and improve the taste and appearance of the product. Some additives and preservatives are added to products by the manufacturer and others are added by the suppliers of the raw materials. Pet food manufacturers are not required to list on their labels the additives and preservatives that were added by the supplier. One should also note that even though pet food manufacturers may not add artificial preservatives to their pet food, they have probably already been added to many of the ingredients by the suppliers.