We had an occasion to have family down last year. I have a Red Heeler, they brought down a Pit Bull and a Terrier. It was like something you would see in a cartoon. Someone let my Heeler in, the terrier attacked, my Heeler got it and threw the dog across the room then went for the Pit Bull. I did stop her before this encounter occurred. I was pretty sure of the outcome of that fight. Before the night was over with the pit bull and company were sent to other relatives.