DNA Contest Hint
I've been watching the answers come in and realized I need to give a little hint.
The dog actually has five breeds in him, some you'll definitely need to think outside the box. I'm going to give you one, so you'll only have four left to figure out.
He is part Chow Chow, in the middle picture shown on the original post you'll notice the black tongue. The picture isn't very clear so it's only fair I give you that one.
So there you have it, one down and four to go. If you guessed before you can submit another answer.