I have given marrow bones raw, and knuckles smoked. The only problem I ever had was that one of my girls got her muzzle stuck with the bone around the bottom part of her muzzle. I hadn't dealt with that and figured they would have to cut the bone off of there, so I took her to the vet. But the vet said there was a trick to it, and was able to unhook it without any problem, no charge.
I wish I could find the knuckles raw.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC