Raw marrow bones (soup bones). Not the joint parts as I find it constipate all my dogs I ever had. Also not too often to wear their teeth down. They can play with it for weeks once they've eaten the marrow inside. And rubber toys as it keeps teeth white. Treats I give only grain free. Whatever you do, don't give milk bone or stuff like that.
I used to use vetiq minties. They had decent ingredients and are made in the USA. I can't say much about their effectiveness because fezzik doesn't really get bad breath. I stopped using them because
I think he is allergic to chicken and he scarfs them down and almost barfs them back up.