No preservatives here! Bones and Chews As Nature Intended. Raw bones, smoked bones, and smoked bully sticks. The smoked bones and bully sticks are not cooked but dried down with a little smoke to add flavor. Most pet chews and bones are saturated with preservatives so they can sit on the shelf for weeks until someone buys them. Not ours! And they're excellent for your pet because they're all natural.