fur color change rabbit

Question
my rabbit had a black nose,ears and paws now the color is changing to a semi gray light color should i worry or is it natural for this  to happen

Answer
No need to worry.  There are some breeds in which their spots or smudges change colors as they age.  Or if they are beginning a major shedding period.  

I couldn't find the exact document I was looking for, but this link details a breeders experience with rabbits changing their fur color as they are age into adulthood:
www.geocities.com/american_sable/CoatColorChangesinSables.pdf