I know that no one will think that I am serious, but I am highly recommending these toys to any dog owner. We just got as new puppy, and she was eating all the furniture. The vet recommended KONG toys, and the dog loves them. The toy is hollow, and they sell aerosol cans of flavored filling to go inside. They dog chews for hours to get the treat. Very cheap too. http://www.kongcompany.com/worlds_best.asp Barry