It is caused by a dilut gene. Reserch shows that they have always been around, and until 20 to 30 years ago most people would do away with a pup until the demand for them was noticed. It is a dilute gene found in the black and choc labs. The only way to get silver pups is to breed a silver with a silver or silver factered, in which You breed a silver to a black or choc. After you have a factered litter (most of the time they are all silver or charcol) then you breed a silver with the facterd and the litter will be born all silver. Not as rare as people say these days.
Answered by Anonymous - 12/16/2012 10:22:57 PM