The fact that the dog was retrained by the animal control officer and then shot, is tantamount to shooting a suspect that is already cuffed. It is unacceptable under any circumstances. In what I saw in the video the animal was not being aggressive and had retreated to the garage that he was kept in. The the officer who it would appear is afraid of dogs by his actions tasers the dog and sends him into a fear driven freak out. At the very least, reckless endangerment is warranted here. Then a large civil suit.
I heard this dog was believed to have been causing a disturbance on the light rail earlier that day.