I didn't allow my dog to keep this toy long enough for her to do any lasting damage to herself.  I should have read the reviews more carefully before ordering because, like a lot of posters have claimed, this product is certainly hard enough to break an animal's teeth. There are plenty of safer alternatives available that won't injure a pet.  Also, despite the rigidity of the toy's material, it's still possible for a power chewer to break off small pieces of plastic and ingest them, something I don't feel is desirable or healthy.