Welcome.. pictures would help, but until then what you maybe seeing is probably normal.. when the pups get older.. in many, the "black" turns to Blue, it can be a very light "steel" blue, and it usually starts on the head/face. The back usually stays darker. In a litter, you may have some pups that stay darker, while others turn more blue. I have not seen it turn to "white" however.
On the legs, I have one girl that had a golden tan leg as a pup (this is a color fault and I was told, she could not be shown with this fault) .. as she matured, the tan became lighter, and now it is almost the same white as the other legs, I notice it is not AS white, but the casul observer would more likely than not,note even notice and say "she has 4 white legs".
Good luck with your two "fellas".. your in or a treat in this "Biewer" World.. there's just no better place to be, in my opinion.
Diana
