J.W. Pet Tough By Nature Good Breath Bones for dogs feature natural rubber to massage dog gums and mint to freshen breath.When dogs chew the Tough By Nature Good Breath Bone, the all natural rubber massages their gums and enhances their dental health, while a hint of mint freshens their breath! Available in Small, Medium, and Large sizes for any size chewer. Colors may vary and are picked at time of shipping.Come in three sizes: Small measures 3.5 inches, Medium measures 3.75 inches and Large measures 5 inches. For use on dogs.