"WORLD'S BEST DOG TOYS" - Kong toys provide unmatched performance and benefits. They are used and recommended by veterinarians, dog experts and satisfied customers worldwide. Puncture resistant super bouncy natural rubber... Kong's exclusive Ultra-Flex formulas are chewer friendly. They are unmatched for resilience, durability and bounce. Ultra-Flex rubber is nontoxic, nonabrasive, nonsplintering and does not get sharp when chewed. Suitable for young puppies from 2 months to 10 months old. Medium puppy Kong suits the following size breeds, Beagle, Staffordshire, Cavalier and similar size dogs and puppies.