This happened because the Sheriff's Department received bad information saying the person they were looking for was at her home.
How often does this have to happen - not just to pets, but even homeowners? How long before that "oops, wrong house" bullsh*t gets a couple of deputies or other LEOs a dirt nap?
"Oops, wrong info. Not our fault. Sorry about your dog." Since this wasn't his first dog shooting, and the article clearly states that he wasn't "injured or attacked", maybe a cruelty to animals charge might be in order? Or is that another immunity of the badge?