Like virtually all of these stories, very short on details and told from the position of making the public angry at the cops. It may well be that he’s an idiot who shot the dog for no reason. OR it could be that something happened (ACDs can be quite sharp and snappy, and especially one with puppies and lots of scary things going on in her house, I imagine the domestic disturbance was “disturbing” to her also).
And of course the owner is distraught, regardless of exactly what happened and her story is going to be, “the cop shot my dog for no reason and needs to pay/be fired/killed/sent to hell on the express train”. That’s natural.
Personally I would always like all of the information before passing judgement.
But I agree with your first sentence. And your last one.
There is no logical reason for him to shoot the dog before giving her opportunity to put the dog in another room.
Since he did so, his version of the story has less credence than hers.
How is it that her mailman, utility repairmen, meter readers and the like all managed to perform their duties without shooting her dog, hmm?
As ever, the soul of reason. No hot-head, you. :-)