[kandy]

I would also suggest that her hearing be checked. It could have started with a hearing problem where the hearing is actually super sensitive so sounds like a garbage truck would literally cause extreme pain. She would naturally associate the noises with pain, and eventually anything that happens to be near the source of the noise would also be viewed with suspicion and aggressiveness. I agree with the suggestion that she may be in pain - I have seen dogs strike out at anything that gets close when they are in pain.

I hope you get some answers for you and your girl.

Oh, and for a recording of city street noises, why not take a small tape (or digital voice) recorder and sit on the street for just a bit?