Petface Doggy Bistro Chicken Knotted Bone 8 Pack. Reward your pooch with a tasty little treat with the Petface Doggy Bistro Chicken Knotted Bone. Made from a completely edible vegetable based chew strip, the Chicken Knotted Bone contains no indigestible rawhide and has been made with a combination of prime chicken meat and vegetable matter including sweet potato and rice to ensure your four legged friends will be howling for more. To ensure complete freshness, the sealed packet includes a oxygen absorbing sachet to ensure optimum freshness and a delectable flavour.