From bestbullysticks :
Terrabone is the world's healthiest and safest edible dental chew bone for fresh breath. The #1 ingredient in a Terrabone is USDA certified organic brown rice. Unlike other edible chew bones, Terrabone contains no animal by-products like gelatin or animal glycerin.
Sam's Yams "Veggie Rawhide"
Ingredients are simply:
They look, smell, and I suspect taste just like the sweet potatoes I bake for the dogs: