Thrive treats are 100% Pure & Natural and this pack has nothing But 100% freeze dried chicken hearts. Chicken hearts contain fatty acids, vitamin A, vitamin B, iron and taurine making this treat rewarding and also nutritious. Chicken hearts have an intense flavour which helps your dog to focus on you. Ideal for dogs sensitive to certain foods. Chicken hearts are completely free of derivatives, preservatives and other questionable things, just compare our ingredients to those of other dog treats. Our dogs are our family so we only use ingredients of the finest quality.