One of my dogs, Alice, is the obvious dominant dog between her and my pitbull. She's a mix of herding breeds, so she's always overly concerned with what Duke (the pitbull) is doing and if he's doing something wrong. When he's doing something and I've asked him to stop, she'll do the corncob nibble on the side of his face which almost reminds me of rat power grooming. This is the only time she does the behavior, so I know why she does it, but I was wondering if anyone else has encountered a dog that does this to other dogs with the same intentions (putting the other dog in his place). It's almost as if she's disciplining Duke for doing something he's not supposed to. It doesn't hurt him and it's not a real bite, so I've never really attempted to intervene since I figured it's just part of their dog pack dynamic.