You keep dismissing the previous complaint against the dog as simply being for "barking".  Where are you getting that information? Have you actually seen the previous report?  Also, you insinuate through your crusade that the dog has only ever engaged in aggressive behavior on one other occasion citing the single instance recorded by the city's animal control, which is a huge stretch to accept. 

I understand you are just being an advocate for animal rights and welfare, but you need to seriously step back and consider the likely reality. Where there is smoke, there is fire. Case in point, the article I cited before, involved a dog that attacked a woman, had a history of aggressively approaching and snarling at people and yet had no documented record with Animal Control. The dog was not innocent and of the best nature, as the owner himself has acknowledged. Is it that hard to accept?