Raw pork bones are fine, actually, just to clarify (although most are too touch for tiny chi teeth, Betty has had raw pork bones in the past and no issues).
No need to wash them first, I mean, you can rinse them if you feel better about it, but they don't need to be. Dogs don't process stuff the same as us, theirs goes through them much faster and therefore there is limited time for bacteria to build (unlike human insides where it stays a while). It's how they were built from before they were "domesticated", their insides have not changed much at all.
Betty has never had a problem with any meats (altho pork that is "enhanced" gives her the scoots). Her fav is chicken wings and rabbit ribs! Nomnomnom!