My 10 week old bully is chewing on a bone as I write and I'm not worried at all. The bone is so big he can't choke on it. Whole bone is essential for healthy teeth, grinded bone don't do much for cleaning teeth. Raw is better in it self for teeth, but they will get tartar without chewing bone.
And shouldn't your bf be paranoid about feeding kibble, not bone, since his OBD choked on kibble, not bone????