He COULD be purebred lab but I don't think so. He is a little bit hairier than a labrador...I think. All the lab puppy's I've seen look less hairy. Also his brother's had white on them, and they were black labs. Of course, we don't exactly know if these were his brothers, but there is a good chance. Then there was Furball.... lol.
All I can say is Labrador mix I guess.