I have a 125 lb bullmastiff that is a little over one year old. We have gone through many "tough" toys for "strong chewers" that he destroyed within minutes to hours. I bought the bumi last Christmas. It's Christmas time again and the bumi is still around and still all in one piece. Although a tug toy, he likes to chew on it and listen to the squeaky sounds it makes rubbing on his teeth and gums. This toy seems to self-heal the incision marks made by his teeth.