I promise, #4 buck from in Federal Flight control wad or the Hornady (same exact wad) is going to drop them with a solid hit in the face or frontal shot to their chest. It's near like shooting a slug for about 15 yards sometimes more depending on the gun. They come in the 3" variety too. They'll make mincemeat out of a coyote at 50 yards, but we ain't talking coyotes either. I can really believe that if they were shot with the low recoil versions. They are just wimpy loads, good for competition and target shooting, but not so much for serious work.
I agree with you shadowrider, by all means. I'm just saying that there is a lot of times where the rules that have always applied just go out the window. There's always exceptions. Take the guy I read about a few years ago up in Yankee land who shot a black bear several times in the head with 20ga slugs, only to have the bear eat half of him before it died.
And assuming that the dog who was shot twice was shot by OCPD, I think it's safe to say they used the low recoil rounds, as my understanding is that the low recoil is heavily preferred in that line of work and is marketed to Leo's and military.