What’s the real reason
Sadly, it appears to be practicing on animals, so they have less compunction to use them on law-abiding citizens.
Obama needs to have his Civilian National Security Force, you know.
“What’s the real reason”
Because they can. Cops get to do all sorts of things that normal people would never get away with and in the past few years they’ve decided to start shooting dogs. This is a relatively new phenomenon and is likely linked to the militarization of the police across the country. Shooting people’s dogs is an effective way of letting people know who the boss is and it is also a handy way for certain cops to bully people. And, so far, I don’t know of any cops who’ve been reprimanded for shooting dogs, even the hero who shot a two-pound teacup Chihuahua a year or two ago got away with it.