Watch this video taken from a police car, a police officer gets out of his car and two dogs run around him with the only real contact between the officer and the dogs takes place when he kicked one of them. After a very short time the officer shots one of the dog literally point black and kills it, this is followed by a heated argument with the owner of the dog who finally opens his door in response to the gunshot.
At first it seems like the officer is completely guilty however after viewing the video again (and paying attention to the noises the dogs make) it becomes clear that the dog owner should not have left the two dogs outside unsupervised and free. Even thought the dogs do not seem to be aggressive (wave their tails and jump around) the police officer had some reason to think he may be at risk, and the conversation later suggests that this officer had been bitten in the past.
However if the officer is suffering from fear of dogs he should not have even gotten out of the car. The one thing that stands out here is the way that the police can act without real challenge, further enhancing that “do not mess with cops” attitude. In principle the police is there to help, to protect and serve the public – not act out brutal acts that can not be changed out of the feeling of superiority and power.