What is this on my porch that is on my video cam?

I saved it, enlarged it, brightened it, changed the contrast and saturation, and I still can't get much out of it. To me it looks sort of like a bobcat, regular cat, or a raccoon...maybe a dog. I wouldn't worry about it, but review your tapes daily and see if you get recurring sightings of this...creature. Try turning a porch light on at night so you can see better, or set up flashlights on your porch and stuff. See if you can get a clearer image of the creature. Like I said, though, I wouldn't worry about it.