Pippin loves her busybody bristle bone from PetCo. She is a hard chewer and this was the first thing she played with when I brought her home two months ago. She still loves it. I don't use the rawhide refillible treats. The first time it gave her loose stools. The bristles help clean her teeth.
PetSafe Busy Buddy Bristle Bone Dog Toy at PETCO
In fact, my mom is getting one for when Pippin visits Grandma.