Oh.. and what they said. Let the dogs sort themselves out, they will figure out fairly quickly who is the alpha dog and the particular pecking order within the subgroup. People freak out when dogs nip, growl and butt sniff, but it is all hard wired in them, and I find that it doesn't take very long with no interference for them to settle each others individual hash. You might catch slight "reprimands" from the alpha occasionally, but unless a dog has been neglected or has a behavior disorder, they won't hurt each other. They may yelp, growl, whimper, or pee on the floor, but (very)rarely is blood drawn.
