You know, I know I am probably stepping outside our "high road" creed in this response, I apologize.
My wife and I are dog people. Our oldest dog, is 9 years, I brought him home wrapped in my sweater when he was 7 weeks old. Both of them are pit mixes, to those who own them, you understand the bond that implies, to those who don't, you imagine a dangerous dog, and I can't help you.
regardless, both of our pups are like children to us. I am sure that I would, right or wrong legally, fire away to slide-lock at any armed person who showed up unbidden on my property with the intent to destroy my dogs, whom I look upon as my children.
This story just breaks my heart on both ends, the officer who would do such a thing, and the owner who would let him.