Chiming in here too

Roxey isn't really possesive about her treats but very possessive about her food balls. No one gets those...period! But luckily there is never a fight about it. She's pretty mellow. Her and Bon or Huney can have treats together and there is never a word from her.

Now Bon, he's another story. We had this problem from when he was a puppy. He always wanted Huney's treats. A couple of times he even jumped on her (nothing serious though). I DO NOT let him and Huney have treats at the same time in the same room. I put him out and she stays in, and she's like Beenie..won't eat her treat unless I'm right there so I just stay in with her and Bon and Roxey go out.
I even tried putting him in his crate but as long as he's in the house Huney won't even touch her treat. She's very submissive.
So I wouldn't worry about it, just prevent it

Needless to say they don't get "good treats" like pigs ears or bones much