After losing my husband's expensive work boots to our 6 mo old lab, I invested in the Zogoflex Tux. Great toy! But now after 3 weeks, she has removed two of the knobby ends, but still continues to enjoy chewing it. The loud gnawing of the rubber makes it difficult to watch television or sleep at night, but I go to bed knowing that our belonging are safe, for now at least. I better get back and order another one quick!