Since dogs don't floss regularly, they need a way to keep their teeth clean, and that's where the Kong Dental Kong Dog Toy comes in. This bone-shaped toy has a hollow center for treats, and while your dog is chewing on the durable non-toxic toy, it actually cleans his teeth and gums. The patented grooves prevent plaque and tartar buildup while also freshening his breath. Choose from four different sizes to suit your breed of dog. The small and medium sizes feature an exclusive 15-inch diamond-braid cotton floss rope that removes food debris. Large: 5.25 inches long, recommended for dogs 20-65 pounds. Small: 3.25 inches long, recommended for dogs under 20 pounds.