Update on Nina, our 1-year-old lab/pitt mix; we took advantage of the one-time replacement guarantee (she chewed one of the "knobs" off in about a week.) Well, the replacement Tux arrived today, and she must have "learned" the best way to chew through the material the first time, because in less than an hour she had the toy completely torn apart. Slightly disappointed, but we are all too aware that there is no such thing as an "indestructible" dog toy!