My roommate tried to take it from him and he just watched her take it. He's super passive. But he does know that I'll tell off Gypsy for coming near his bone. He drags it until his little but is next to my and I am able to see and protect the bone for him so he can enjoy it. Why should he growl and protect his own bone when I can do it for him? 

He will growl to protect me though. I have fallen asleep on the couch with my brothers around. If he wasn't there, my bros would have pulled a prank on me. With Kaji there, they try to sneak up on me and he growls like he was a german shephard.