I have been attacked twice times in the last year by two different pitbulls. Both were extremely friendly, and had strayed into my yard enough that I knew them by name. I have heard over the years that pitbulls have triggers ( a trait common within pitbulls), snap tempers. I breed and work bird dogs, and have a fair understanding of dogs in general.
The first strayed into my yard last summer 6-7 times, he has super sweet. I had returned him to his owner all but the last time, no problems. Then the last time I had him by the collar and was walking him back to my kennel, to keep him until the owner showed up. When I rounded the corner of my house he grabbed me by the arm, I let go on the collar, and he made a break for one of my dogs. My award winning German Shorthair Pointer, GSPs don't fight well, and in seconds he had torn my dog up so badly that there was a three foot circle of blood in my back lawn. With my dog pinned I started kicking the pitbull as hard as I could, which didn't phase him at all.
He finally let go and ran off. My dog barely survived, and the pit was recovered by animal control where he died that night from pucntured lungs (me kicking Him).
The second had been hounding us for several months. He is a little over a year old, one of my neighbors got him at 8 weeks. He tries to fight every dog he sees, and thanksgiving day he attacked me, and chased me into the bed of my Brothers pickup. We had just returned from hunting, and hadn't unloaded our gear. He tried and tried to get into the bed of the truck to get at me. so I took my shotgun and peppered him. He came back last night, and tried to ram his way through my back sliding glass door. Sheriff says he has better things to do than chase dogs.
Moral of the story Pitbull owners please keep them from getting out of your yard, and don't underestimate them. I am sure than can be loving but if they want to hurt you they can, and they give no warning! I have never seen a breed give no warning at all like that, Bipolar.
"If we lose freedom here, there is no place to escape to. This is the last stand on Earth."
Its not just pitpull owners, its all dogs. The owner should be able to tell if their dog is a problem or not. Owners are required to keep control of there dogs at all times. 95% of cities require all dogs to be on a leash. But is usually enforced only if there is an issue.
I'd keep calling the cops and keep it on record. I don't recommended going to the owner (only if you know him, say something) because usually a rampaging dog means not the best of character for the owner (they don't care enough to train the dog correctly so why would they care about you). And I'm sure you are not the only one that has a problem with this pitbull. Get your neighbors together and demand action.