I can't remember the episode name, but there was a ferret on one episode of
NORTHERN EXPOSURE.  It was the one where the doctor drank some of the
'medicine man's apprentice's' magical juice, thinking it was OJ.  His 'trip'
to New York was funny, but it was more interesting waiting to see where the
fert would show up next.
 
Unfortunately, like in KinderCop, non-ferret sounds were added to increase
the dramatic or comedic (sp?) effect.
 
(Sorry, I never watched the show enough to learn any of the character's
names...I only watched that one episode because I had been told there
was a ferret in it.)
 
Joe, with Billy in my lap and Garret tearing up my potted palm.  (He
wants a starring role in the ferrettown version of Mr. Roberts.)
[Posted in FML issue 1666]