Made with fresh, whole, animal protein, Marshall Ferret Extreme Freeze Dried Treats Salmon Chunks 0. 3oz provide essential nutrition that every ferret wants, while fulfilling your ferret's carnivorous desire. These protein treats are bursting with flavor and are grain and gluten free. The fresh whole salmon have not been cooked or over-processed, but freeze dried, to preserve the key nutrients. They are a healthy, preferred choice for training, traveling and snacking.