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Actually, it is not possible even in the 1 in a million numbers for a pure bred Golden to be totally black. Goldens are genetically black but in the recessive form, which makes yellow coat color. You can get black spot phenomenon which could have fairly large black spots, but those are from a somatic mutation where a cell mutates from the recessive yellow to the dominant coat color which is black but NO Golden Retriever has the dominant allele or they themselves would be black since it is dominant. The mutation that causes spotting is something that happens during development. But a totally black dog would require an actual allele being dominant- which is something that is heritable since all dogs inherit one allele from each parent of each pair.
Anney Doucette (forum member) wrote a really understandable article on this for the GRN. You might try to locate it.
Last edited by Prism Goldens; 12-21-2016 at 08:11 AM.