Chunky Chews&reg; 7"-8" Natural Rawhide Safety-Knot&reg; Bone for Large Dogs 100% Premium Rawhide with patented Safety-Knot design helps prolong chewing. Up to 3 times heavier than bones of the same size. Made with grass-fed free-range beef hides. Antibiotic & hormone free. Designed for big dogs and aggressive chewers.