If you'll view some of the reports at the above linked website, you'll see that many times the cops are killing dogs of crime victims, not just those belonging to criminals.
It happened just a couple weeks ago in Winston- Salem.
Incoming WS Police Chief Shoots Woman, Dog
Myself, I'm not overly fond of pets. I despise people who allow their dogs/ cats to run wild, intimidating people and killing wildlife. Still, I'm all for humane treatment of all creatures. If that isn't enough to cause one to be upset about the police who routinely kill pets, consider this: Rarely is a law officer charged with a crime when this happens. Consider also that police are rarely punished for shooting citizens.
Think of those two things while viewing the Dogs That Cops Kill website.