Karen is right--ANY breed of dog, or ANY creature for that matter, can have an albino variant. Albinism is caused by the total lack of skin pigmentation, a rare trait that can manifest itself in Labs, as well as other dogs and even people!! I think you are maybe confusing albinos with dogs that are simply white. White dogs are not necessarily albinos. Only if they have pink eyes, i.e. with no pigment, are they considered albinos.

I used to have an albino guinea pig...her name was Baby, but we always called her 'Bino for short!!