Agree with MAC.
I thought sasha had something wrong with her diet or SOMETHING at 8 months old, she was loosing the 'shine' and had started going 'fluffy; on her back end and just didnt look right.
The breeder had a look at her and assured me the same as MAC was saying, the 'puppy' coat was dying and just needed to be stripped out.
So she did (with a mars comb) and, yes it worked. sashas coat was back to normal colour, shine and vitality.
anyways... thats my 2 cents.