Pitbulls may have more aggressive tendencies than some breeds but don't let anyone blame her problems on her breed. There's no reason your pit can't be retrained and socialized to stop her from attacking other dogs. The key is understanding what is making her behave that way. One of the biggest motivators for one dog to attack another is food aggression. If the dog is hungry or exhibited food aggression or anxiety as a puppy, it may be reacting with hostility to fend off other contenders for its food source (whether real or imaginary). Another primary cause for aggression is defense of territory, and pitbulls do tend to be territorial. Finally, some dogs react aggressively out of fear. Instead of running or backing down, they put on a show, complete with bared fangs, growling, lunging, etc. The first thing to do is establish yourself as the "alpha" and make sure your dog respects you 100%. After some socialization, a firm "no!" from you should stop your dog in his tracks if she's going after another dog. Start socializing her by exposing her to older, well-trained dogs who won't be intimidated by her behaviors. After she knows her place with them and shows physical signs of submission rather than dominance, take her out in public often. At first, put a non-metal muzzle on her then as she gets better behaved, remove that, but always keep her leashed. That way if she gets into a brawl with another dog, you'll be right there to break up the fight. If you can afford it, a basic obedience training class, where she will be forced to tolerate and ignore other dogs, would be good for her. I train and rehabilitate rescued wolves and wolfdogs, and that can be challenging but understanding the basic motivations behind canine behavior helps a lot.
