I have a medium-hair cat who has a lot of dandruff/skin flakes showing in his
black fur.  I brush him every night.  The only thing I can think of is that I
put in a window air conditioner a month or so ago.  Since the air conditioner
removes moisture, maybe it's too dry in here.  Short of not using the a/c unit,
what can I do?  Is there a supplement or a remedy that really works?

Thanks in advance!