What breed(s) is this adorable creature!?

I looked at the picture before reading the other answers, and Rottie came to mind immediately.

his head looks like a Rottweiler head but his colorings aren't of the Rottweiler. he also might be part mastiff or maybe a pit bull. If you really wanted to know what he was than I know that some vets offer DNA testing for dogs in which they take a cheek swab of the dog and get it tested to see what breeds he has in him.

I agree that he might be part Rottie, but the rest could be just about any medium to large breed with a fairly short coat. He's very cute!

I would agree with the other answers and say rottweiler/lab mix. I see a rottweiler head and coloring, and I see some lab in him as well.

Wow, it is a cutie! I would definitely say part Rottweiler based on the head shape and the face. However, the other, I am thinking. . . a lab? Perhaps this dog is mixed with multiple dogs, the son/daughter of two mixes? The only truly distinguising feature I see is the Rottie head and face (and body size), but it completely lacks rottie coloring. That's the best I can say!