Rescued dog. But what is he???

Hey all. I rescued a dog from a shelter but we can't figure out what he is. He came in as a stray so there's no way to tell. The shelter is saying he's a pitbull mix but I don't think he looks like a pitbull puppy at all (from what I've observed on google images).

They think he's possibly mixed with boxer?

Any guesses guys?
:hail:



Video from when he was at the shelter
http://www.youtube.com/watch?v=yAVxiRKqJts

First let me say what an adorable fellow you have! It's always hard to tell when they're little, but, given how many pitbull type dogs there are, pit mix is a pretty good guess. So is Boxer mix. You'll never know definitely what he is, but it will be easier to make an educated guess when he's older.