Barkworthies Duck Jerky 4oz Barkworthies Duck Jerky is a highly digestible treat that is high in protein as well as grain and gluten free. Each piece is baked to perfection, so it's simply bursting with savory aroma, texture and flavor your dog is sure to love. Most Barkworthies' all-natural dog treats and chews are completely preservative-free and additive-free. Please note that this product is not for human consumption. Please supervise your pet while giving a treat or chew and dispose of properly if it becomes a choking hazard or develops sharp edges.