Beat me to posting the article! LOL. I found it through icanhascheezburger.com, ironically... so it's certainly making its rounds.
Honestly, I like having pets around just so that I don't freak out in the dark. This might sound a little neurotic, but I'm a little bit afraid of boogeymen and the like and tend not to walk through dark rooms if I can help it. But, if there's a dog or cat around, I don't even care because I figure they'd notice everything from vicious ghosts to a measly little spider on the wall!