I don't think we've heard the last of these puppies. It has always been likely that dogs that are free to roam wild will be feral... just like cats and just about anything domesticated since all domesticated animals originated from the wild. These animals in a pack... roaming around killing without feeding (although the article doesn't specify) one imagines that when it's said they're killing for fun. Not even wolves do that in the wild... every kill is for food. But these are domesticated dogs turned wild... I'll wager that they aren't as afraid of man (as much?) as their ancestral counterparts are. Plus they tend to roam at night. Which of course makes them more difficult to find/capture/kill. Hopefully doors will be locked and windows shut tight at night around homes that are in a semi-rural area as well as ranch homes where many times they're isolated with a few homes within a 1 mile area. I wouldn't put it past these animals to eventually start seeking human prey. We are vulnerable especially unarmed and/or alone.