KONG EXTREME DOG TOY: Color Black, Size Medium The KONG Extreme dog toy represents the most durable strength of KONG rubber; Mentally stimulating toy, offering enrichment by helping satisfy dogs instinctual needs; Recommended worldwide by Veterinarians, Trainers, and dog enthusiasts; Great for stuffing with KONG Easy Treat, Snacks or Ziggies; Helps reduce boredom and separation anxiety for powerful chewers.