KONG™'s exclusive, legendary nontoxic red natural rubber is puncture resistant, super bouncy and chewer friendly. It is unmatched for legendary strength, resilience, durability and bounce. KONG™ toys are enthusiastically used and recommended by veterinarians, trainers, dog professionals and satisfied customers world wide. Medium KONG™ are for Beagles, Cocker Spaniels, Shelties and Similar sized Mixed Breeds