My dachshund is a destroyer. He's very good about only chewing what he's allowed to chew, so I love to reward him with toys. His favorite hobby is to rip open squeaky toys and pull out all the fluff - he can demolish one in less than 5 minutes! He doesn't like rubber toys,  but even kevlar and fire hose toys have a short life around my dog. What would be a good challenge for a dog like this?