Start with your community or your county or your state, whatever works best for you. Get organized, get focused, and get the damn laws passed to rein them in.
Better do it. And don't forget, the police don't only kill dogs. Paramilitary police, SWAT teams, actions against citizens recording police activity -- these are additional concerns.
Don't just sit there typing. Do something.
Huah. GREAT POINT. Gonna do it.