KONG Puppy Teaches appropriate chewing behavior while offering mental enrichment Soft puppy KONG rubber formula is customized for puppy teeth and gums Unpredictable bounce for games of fetch Great for stuffing with KONG Puppy Easy Treat; Snacks or Ziggies Recommended by veterinarians and trainers worldwide Natural rubber Made in the USA. Globally Sourced Materials. The Puppy KONG dog toy is customized for a growing puppy’s baby teeth, the unique, natural rubber formula is the most gentle within the KONG rubber toy line.