Jurors are not automatically going to take the side of the police when an officer overreacts to a dog who surprises him. I know I wouldn't.
Exactly! A dog does not know the difference from a police officer and a burglar. My dog would defend me against any intruder. If a police officer were to break into my home by mistake, he should expect my dog to growl a warning at least, and he better not shoot my dog!