I live in a 12-unit townhouse complex that backs up to a public park and child's playground. The complex is gated, but the units themselves are side-by-side in a U-shape and are for the most part open to the common areas (walkways, pool, etc). One of the owners two doors down either just got a pit bull, or has a friend who who owns one and visits them frequently. A few days ago, a couple kids were sitting out on the steps in front of their place with the dog, which barked at me when I went to the mailbox. That was the first I've seen of the dog and I didn't really think anything of it as some of the other owners in our complex have dogs that bark. However, a couple hours later, another owner here said he's seen the dog, on several recent occasions, show aggression (pulling at end of leash and barking/growling) on people while he was being walked in the park, and at pedestrtians walking by on the sidewalk in fron of the complex. Now, the neighbor/possible owner in question is a 40-something single mom with a 20-something son and 14 yr. old daughter. They are not exactly the model neighbors in that it is common to have people coming and going from the place all the time, and for awhile almost nightly between 12:00AM - 4:30AM. I think half the time the mom isn't even there, and when she is she's partying with them. They also seem to have different people living there on a regular basis. So...we (the other unit owners) have had to put up with other issues from them as well. My point is this...having two young kids and their little friends that visit often, I'm not thilled about the fact that my neighbors may have actually gotten a pit bull and are raising it in their condo, and that it is apparently exhibiting aggressive behavior. I sent them an email requesting that if it is a friend of theirs that owns it, that they insist he not bring it around here when visiting (I inferred to the huge legal liability as well). But if its theirs there isn't really much I can do other than cringe at their absolute lack of good judgement. I have a small arsenal, but with kids in the house I don't want loaded guns around waiting for The Day The Dog Goes Off. What are my options? Should I ask them if I can introduce my kids to the dog in hopes the dog can become familiar with them or is that a waste of time. Should I go ahead and call the police and animal control now before anyhting gets out of hand? Am I just being a paranoid ass? What would you do?