Tazz taken it to another level

Tazz has finally proven to me that he thinks he is the alpha dog in the house. Today as I open the door to let the dogs out. Immediately when Chico steps outside, Tazz starts to attack Chico for no reason. This was not an ordinary attack on Chico. Tazz was a little more fierce. This altercation was very aggresive and mind blowing. Tazz was on top of Chico chowing at his ear as Chico was under him barking for some kind of relieve. Next thing you know I come outside and Chico is on top of Tazz. I yell at Chico and Tazz to stop and they ignored my hollers and continued to brawl right there on the patio. I pull them away from each other to find that Chico face was bleeding and Tazz had blood around his mouth. Now every time any dog goes outside whoever gets out first waits for the other dogs and bite at them when they come outside. These breeds of dogs are suppose to be small little innocent dogs, but instead they act as if they are full grown pit bulls.