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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.. Composition. Beef Bone, Venison Meal, Wheat, Fats & Oils.. Analytical Constituents. Protein 50%. Fat Content 22%. Crude Fibre 3%. Crude Ash 18%. Moisture 7%