Go ahead, turn the bag around and look at our ingredients. PureBites are made with only 1 ingredient; 100% Pure USA Sourced & Made Beef Liver. Dogs love the taste of PureBites because our treats are freeze dried RAW to lock in the aroma, texture and freshness they crave. Dog parents love PureBites because our treats are 100% pure and rich in nutrients for a happy and healthy life. PureBites limited ingredient RAW proteins are sometimes subject to settling dust or dust created by friction within the bag. Some proteins being more susceptible to this than others. The dust has no adverse effect on the actual product and is most often used as a topper for pets food, when the bag is at or near completion.