Stewart Pro-Treat Freeze Dried Liver Treats are made in the USA without additives or preservatives in a USDA inspection facility. Pro-Treat Freeze Dried Liver maintains the aroma, full-flavor and nutritional value of 100% raw liver. Fresh, conveniently freeze dried and diced into reward size treats, Pro-Treat is an excellent reward and training tool. All natural Pro-Treat has been the preferred choice of trainers for over 40 years due to its convenience and palatability. Stewarts treats contain only one ingredient and are perfect for dogs with allergies or those who are on limited ingredient diets. Made with 100% pure beef liver.