Sophie will be 16 weeks on Friday and her head is really light under the black, it seems to be growing in silver at the roots. It started laying down a bit too dince it is getting longer. Her chest is lighter too, I was comparing pics of when I got her November 1st and she has already changed a lot. Vet was Saturday and she is 3.2 lbs.... she was 2lbs when I got her! Just like watching your real kids grow!