I have a Jack Russell mix. I also have a Min. Pin. mix. They don’t have a lot of socializing with other animals or people. When someone comes to the door, they both go absolutely crazy barking, into a crazy frenzy. Then the Jack Russell attacks the other one fighting. Any time when the adrenaline is running crazy excitable over anything, the Jack attacks the smaller dog and the fight is on. I literally have to pull the Jack off the min pin. What is that all about? Can you help me?