The black rubber compound of our strongest, most durable version of the classic KONG toy is recommended for the most powerful chewers. This American-made chew toy is perfect can be stuffed with pastes and treats. It helps fight boredom and can relieve mild anxiety or frustration. It is designed to provide unpredictable bounce, ensuring stimulating games of fetch even for the most seasoned user. This item is used worldwide by police, drug enforcement and military K-9 teams, as well as Schutzhund and AKC competition trainers. KONG products have been recommended by pet owners, veterinarians and trainers for over 30 years. This size is suitable for dogs weighing 30-65 lbs (13-30 kg).