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Hollings Pig Trotters. 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.. Hollings pig trotters are 100% natural and air-dried to lock in the goodness. High in protein, iron, zinc and Vitamin B12, and they're a beneficial longer lasting chew which makes them a source of mental stimulation that will help your dog be happy and satisfied. Not suitable for puppies, dogs with poor teeth or elderly dogs.. Composition. Pork (100%). Analytical Constituents. Protein 45%. Fat Content 23%. Crude Fibre 9%. Crude Ash 16%. Calories: 347 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.