Pro Reward Chicken Hearts 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. 100% Chicken Hearts Analytical Constituents Crude protein 72.1%, Crude fibre 0.3%, Crude oil & fat 15.1%, Crude ash 4.2%, Moisture 8.3%. e recommend that you do not exceed the following daily quantities in order to keep your dog’s calorie intake at a reasonable level. Small breeds 4 pieces Medium breeds 6 pieces Large breeds 8 pieces Giant breeds 8 pieces Ensure fresh drinking water is always available.