I can understand all the scientific talk and whatnot that supports the hyena dog theory but really I don't think you are looking at the most likely possibility. This strange beast, similar to the tazmanian wolf in many characteristics, has been roaming about unchecked by the dogs and cats of the area. Everyone seems to be comfortable with it, as if it has some sort of brainwashing ability it uses on everyone who sees it. So my guess is it is a supernatural creature that has newly migrated from it's home (south america perhaps?) This leads me to believe that this creature is the one and only, legendary, El Chupacabra. Let's just see who will be buying who's e-drinks eh?