We hace a golden retriever puppy 7 weeks old and he appears to have a lot of dandruff. None of the others in the litter have it.  Is this a common thing and will it go away in time?  Some of the puppies have a tiny bit of tear stain below their tear duct.  Is this a 'puppy' thing also?

I wonder if it might be cheyletiellosis (walking dandruff mite) although you would suppose the others would have it too.   I would have him checked at the vets anyway, whatever it is it suggests he is not in full health at the moment.