Maybe the dog had a history of biting/aggression? They did show a photo where the dog appeared to be baring his teeth at the photographer. I've been bitten in the nose twice - first was when I was a kid bothering a dog who was eating which just resulted in a small scar so the dog inhibited the bite. Second was one of my dogs who was a puppy and playing. He didn't mean any harm but was disciplined and never did it again. Neither were put down, but I would put a dog who had a history of serious aggression that could not be trained down. That said, don't let a dog with behavior problems sleep/hang out on your bed!!