My Badger & his son Punk (both Aussie mixes, both part of my pack of 7) got into it just a few days ago in the large back yard and had to be pulled, kicked apart. Neither was hurt but mostly because although they had each other by the neck and were both shaking each other their fur is so thick & long around the neck no blood was drawn. They've been fine before and have been fine since but excitement no one needed