These barkuterie boxes offer the following: Beef lung - Good source of vitamins A, D, E, & B12, as well as a natural source of iron. Freeze-dried chicken - Great low-cal, protein filled treat. Chicken foot - Natural source of glucosamine and chondroitin which support hip and joint health. Freeze-dried strawberries - Good source of fiber and vitamin C. Freeze-dried apples - Good source of fiber, vitamin A and C. Banana chips - High in potassium, biotin, and fiber.  Dog Treat.