Join Date: Sep 2011
Location: Germany- but not German =D
Let them crack on. So long as it doesn't get to the point where they're literally ripping chunks off each other, they're just getting their pack sorted, new guy will probably be the bottom for a while.
Every time we have bought a new dog in to the home, or a friend's dog comes over, our matriach Sorrel wants NOTHING to do with them, and it usually takes a week for them to settle.
I would ignore the three of them until they sort it out. Growling and snapping is fine, but if they're going in to harm, watch the teeth, don't listen as they sometimes make horrific noises, then you need to think about rehoming the new dog.