On the facts so far I am with the police officer.
So, you believe the police officer to be an incredible shot, managing to shoot the BACK of a charging dog’s head?
Moreover, if the police officer was in the right, why no (justly deserved, in my view) ticket for the owners for failing to comply with the leash law? No fine for the dog’s purported aggressive behavior?
The actions of the police are more consistent if you suppose they examined the facts and decided the officer used poor judgment.