Used by police, drug enforcement teams, and the military for training working dogs, this super-tough toy stands up to jaws of steel. Even if your dog's job rarely takes him off the couch, the Kong Extreme's goofy, unpredictable bounce makes for hours of chasing and fetching fun--just the thing for animals whose life in the wild consists of tracking, killing, chewing, and then doing the same thing all over again. When you're away, simply stuff the hollow interior with treats or gooey peanut butter, and extracting the contents becomes a "hunt" to keep any pooch happy and busy all workday long. Chewing Kongs helps promote strong jaws, clean teeth, and general oral health. Even aggressive "power chewers" will find it hard to bite through carbon-formula Ultra Flex, and dogs with separation anxiety or problem behaviors like barking and digging will especially benefit from the mental and physical stimulation.