I have a cat that looks a lot like the one protecting it's territory from behind the window in the video above. My guy weighs 18 Lbs. though and he's just as aggressive when he needs to be. He's strictly indoor but has bolted out the door to chase after stray cats a couple of times when I wasn't paying enough attention. My understanding is that cats with this type of marking (some people call them "Tux" cats due to the the black and white markings looking like the formal attire men sometimes wear) often exhibit "dog-like" behaviors. Mine chases its tail sometimes.....just like a dog. I have even had a veterinary tech say "gee, he kind of looks like a dog when you look at his face". I have yet to hear him bark though. That'll be one for the history books!