Give your dog the ultimate chewing challenge with the Power Chew Knuckle Bone Combo! Made of sturdy nylon, this long-lasting combo toy stands up to the most aggressive chewers and takes their Nylabone to the next level! Add All-Natural Pop-In Treats to this refillable dog toy for a treat and chew time that lasts longer and tastes more delicious! These easy-to-load chicken dog treats securely fit in the chew toy and allows your dog to enjoy each treat from both sides. Small in size and big in flavor, the treats are highly digestible, contain limited ingredients, and proudly made in the USA.