Detroit officer and his K-9 both out of control.
Officer and K-9 walk along sidewalk outside private dog-owner's home, separated from sidewalk by chain-link fence.
Home-owner's dog barks at K-9 and officer, officer loses control of K-9, the two dogs snarl at each other at or close to the fence, officer shoots the home-owner's dog. All captured on surveillance video. Will hit the mainstream news soon, circulating on twitter at the moment. Will try to link to video and include here.
As someone says in the thread comments on twitter, it seems to be getting to the point where the police consider they have carte blanche to shoot at anything or anyone that impedes their progress, even to the slightest, insignificant degree.