Extreme Kong for power chewers ... Here is a link with a decent sale:
http://www.petmountain.com/product/h...r-chewers.html
Make sure you get the black Kong. My mixed bullies can tear up a red one quickly.
Like others, my two have gone through hundreds of dollars in other chewies but they are not able to wreck the xxl black kong.
Happy New Year to you and yours.