As a starter, flavor nubs ignite natural chewing instincts, then the robust exterior continues the engagement, finally the edible prongs entice foraging instincts as they drop into the toy once the exterior is chewed. KONG Marathon is natural, grain-free and proudly made in the USA. Placing the treat on the KONG is easy, just simply push and twist the treat to lock it on the KONG and unleash the treating extravaganza.