Hollings Pigs Ears. Hollings Pigs Ears are 100% natural, quality airdried treats for your dog. Tasty, nutritious and a firm favourite of dogs, Hollings Pigs Ears are an alternative way treat to train, reward or treat your dog. Hollings Pigs Ears contain no artificial ingredients, and are cooked to Hollings' high standards and tested for bacteria and salmonella.