here is how I see it...the Dogo gets out and makes a line straight to the cur dog and they bow up to each other...chances are they would have backed off of each other...
my thinking is that you focused your energy on the dogo because you thought he might really hurt the cur dog because of his size and his big hard bite...the cur dogs translation of your behavior was that you were scolding the dogo and so he was going to help you punish the dogo...you were just making sure the dogo wasn't going to latch on to the cur dog because of the damage the dogo could inflict...
also...it happens on a regular basis when two dogs get in a fight the other dogs will jump on the dog that is getting the worst of it...
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