I agree with Pixie. Pitt Bulls aren't the only dogs that are aggressive. Hell, I had a Beagle and I swear that damn dog was freakin' mean as hell! I got him from the shelter because he was so aborable. He played nicely and never tried to snap or bite. Until I got the damn dog home. GEESH! What a disaster. So that goes to prove any dog can go nuts.
Which brings me back to the poster of the Pitt Bull ad in the classified section...one word...