I get the frozen beef marrow bones. They're supper strong and don't have alot of fat or meat on them. I've bought raw hambones before and Chico was able to shatter it into peices and swallow large chunks it really freaked me out. The peices that I took away were as sharp as glass! The place that I get mine from told me that it was ok to feed them pretty often but my dogs mostlylick the marrow out. I don't see them grinding too much.
I have a question though. Since they are raw, is it ok to let the dog chew on them the next day since they've been sitting out all night. Sometimes I'll forget to throw it away and I'll find one of the dogs carrying it around the next day and I worry that they will get food poisening.