I had to kick them all apart. In the process, I was badly clawed. I walked out, bleeding profusely. I have never seen an enforcement official in the woods, and I'm up there a lot. And, of course, banning dogs won't stop those who are already scoffing leash laws.
Dogs frequently maim and sometimes kill each other in dominance contentions.
I've seen it happen and breed is not a reliable indicator. Some of the sweetest breeds are quite handy at this when such situations are allowed to develop. It's like bicyclists running stop signs or going the wrong way - they just really don't want to comply and they take the chance of getting caught. A man walking his unleashed dog along Trail 3 encounters the base camp for Red Cloud Thunder tree sitters. A pit bull immediately bolts from the trailside gathering and attacks his German shepherd.