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Actually that isn't true. Most breeders do not mark colors and send in papers right when the pups are born. One because the first two weeks time are critical and some pups don't make it and also color often changes and for proper identification and showing/working sake they should be listed correctly or as close to what the color is as possible so that there is no question about the dog's papers IMO.You're supposed to list the coat color at birth
I've never seen a blue dog turn black LOL but anything is possible I guess. In my experience most dogs' coats if they change lighten up not get darker
Noses and eyes darken and develop pigment and the white markings often get smaller and tiny white markings may even disappear and often pigment spots show up on white ot light colored areas