Did you bother to read the article before you started condemning the owners?  Well cared-for dogs get out for any number of reasons: they sneak out while the door is momentarily open, the gate doesn't latch properly, etc.  There's a big difference between people who knowingly allow their dogs to roam the streets and dogs who occasionally make a break for it.  But why the dog was out is a moot point; trapping is illegal in Anchorage.  This was an unnecessarily cruel death for this young dog, and we can be thankful it wasn't a child that was caught instead!