Ok, those who have two??? Do yours sound like they are ferociously fighting and they are really just playing? Sometimes my two get going pretty good and I worry that they are getting out of hand - am I just being a worry wart (hubby thinks so)? Neither of them ever has hair standing or anything like that, it is mostly mouthing and growling but they are pretty loud and play pretty rough. Sam tends to pin Lucy down and he is very vocal. I ask other folks with two dogs if theirs play like this and for the most part, they say not to that extent. So, I am just thinking it is the breed. If I think they are too loud or getting out of hand, I tell them to settle or enough and they immediately stop.