Another good chew is Himalayan Dog Chews
Himalayan Dog Chew comes from an ancient recipe of the people of the Himalayas. In the mountains at more than 15,000 feet, it is made using traditional methods with Yak or Cow Milk and all natural products and no chemicals or preservatives.
Polo loves these he is chewing on one right now they last longer then bully sticks too!! I got mine from Ebay you can get them on Amazon too
Himalayan Dog Chew - 100% Natural. Authentic. No Preservatives. An Everest Sized Treat