Hi,
What is your ferret eating as his main diet?  It is possible that there are
artificial colors in his food that make his poop different colors.  This is
not a problem and will not harm your ferret in any way.  I used to feed my
ferrets Meow Mix and they had orange and yellow poop also.
 
Good Luck!!!
 
        Sincerly and dooks, Max Holmquist
[Posted in FML issue 1721]