Bulldogs Are Territorial

We rely on the territoriality of our dog breeds. It is what causes your Golden Retriever to bark in the middle of the night when it hears someone prowling around the back yard, and causes the same dog to go and greet your guests when they come in the front door, or to run out an open door to say Hello to the neighbor across the street. Flock guards protect the sheep on the ranch. German Shepherds keep out intruders. Dachshunds warn of all strangers. And Bulldogs guard property against stray dogs. All of that is great when the territoriality fits our expectations and laws. It isn't great when any of the above happens outside out expectations and control. 

Bulldogs are territorial. There are many dog breeds and mixes that are considered bull breeds, or had bulldog as part of their creation. It is important to know the propensities of a breed in order to properly train and manage them. Pit bulls are one of many bulldog breed variants. 

A pit bull, whether pure bred, or a mixed bred version, is going to be territorial regarding other dogs. You need good fences, door protocols, early socialization, and obedience control to do a good job of owning them. If you don't have that in place, then bad things can happen, such as this story from Streamwood, Illinois... allegedly two pit bulls got loose from the owner's property and killed a couple of small neighborhood dogs and injured their owner... 

Mistakes happen. I get that. But even knowing that won't make things better if your dog has hurt other animals or people, being territorial in ways that are not acceptable to society or the law. 

Whatever breed or mix you have, educate yourself about their true tendencies and plan accordingly.