Hollings Trachea with Venison Filled. Hollings Beef Trachea is a satisfying air dried natural treat with a tasty meat filling. Dogs love the meaty smell and it’s great for chewing and gnawing. Trachea is high in cartilage a natural source of glucosamine which can help to support your dog’s mobility and flexibility.CompositionBeef Bone Venison Meal Wheat Fats & Oils.Analytical ConstituentsProtein 50%Fat Content 22%Crude Fibre 3%Crude Ash 18%Moisture 7%