At my dog park there's a regular visitor: a large red Doberman who patrols others and is thus known as "Officer Dobie." He breaks up skirmishes, not suffering pugnacious pooches gladly.
That’s exactly what he does.
When the bitches get bitchy and start squabbling over toys/blankets/pillows/whatever, he’ll lay here and starting ‘groaning’ which progresses to a low growl and keeps intensifying if they don’t stop.
Finally, he’ll launch himself off the sofa and land between them, growling and shoulder them apart until they go to the opposite ends of their sofa and lie down.
They behave, then.
He apparently really detests discord because it’s not something I ever taught him to do.