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Hollings Roast Knuckle Bone. Hollings natural dog treats are loved by dogs and owners alike. Established over forty years ago, we are founded on a genuine passion and commitment to offer the highest quality naturally healthy treats.. 100% beef bone, gently air dried to help maintain natural goodness. Not suitable for puppies, dogs with poor teeth or elderly dogs.. Composition. Beef (100%). Analytical Constituents. Protein 42%. Fat Content 35%. Crude Fibre 2.5%. Crude Ash 16%. Calories: 462 kcal/100g. Feeding Guide. This is a natural bone & could splinter. We recommend you supervise your dog whilst feeding in a stain-resistant area and ensure fresh water is always available.