No fucking excuse for this shit. If a) you're a canine officer, and b) you live in Arizona (not to mention c) it's fucking 109 degrees out), you just plain know better.
What's funny is he was probably on the clock while he was running around doing errands and lunching with the wife.
Just further evidence that most cops (I said "most" not "all" so settle down right-wing loonies) are dumb fucking cunts. I don't baby my pooches since they are working dogs, but I would never, ever lock them in a car for 12 fucking hours on a hot day, or any day. I hope he does some time for this.