Original Kong. The 1st Kong made was black because the absence of dye leaves this chew toy the most durable of all chew toys. The design was developed to remove and prevent tarter build-up and produce a gum workout while giving that large dog many hours of fun. Made of tough, natural rubber, its durability is only exceeded by the tactile satisfaction offered by the substantial flex of this hollow dog toy. There have been many copies, but this product is truly one of a kind for the pet professional.