http://www.nbcwashington.com/news/local/127826943.html
That's a news article on it...says AC says it's a fox, others say it's a dog...whatever it is can probably be easily captured again if someone was so inclined. Says there's been huge numbers of fox with mange, so there's lots of those out there in the wild just like it, or worse, if it's a fox.
I'm pretty sure its a fox with mange. Just look at those ears! I'm no fox expert, but I've seen plenty of fox pictures to say the ears look like the one's on a fox......Just saying......
It looked like a fox to me, and I kept watching the video trying to see its eyes to be sure. Foxes (with one exception I know of, but they live in Asia) have pupils shaped like vertical slits, like cats. But then again, it might have been a stray dog. Poor thing....either way.