Superior Farms Venison Whistlers are a tasty healthy chew your dog will love! Theyre nothing but 100% all-natural venison trachea which is a good source of joint-healthy chondroitin! Venison Whistlers are free of grains and gluten and contain nothing artificial. Like all Superior Farms products theyre made in the USA! Ingredients: 100% Natural Venison (trachea). Guaranteed Analysis: Crude Protein: Min 60%. Crude Fat: Min 18%. Crude Fiber: Max 10%. Moisture: Max 2%.