Freeze Dried Raw Chicken Hearts: Single Ingredient 100% Chicken Hearts great for your pet's heart health Great size for training and easily breaks apart for smaller pieces Supports heart health: Chicken hearts are rich in taurine High Protein and Low in Fat Freeze-Dried Raw Chicken Hearts. Freeze-dried at peak freshness for maximum nutrient retention. Chicken hearts are the perfect high value training treat for both cats and dogs. These chicken hearts are freeze dried and never cooked. Soak in water to rehydrate back into its orginal raw form.