Now that Dors and Seldon are middle-aged ferrets, they don't dig at the
carpet very often.  A technique I now use successfully to remind them not to
dig is to nail a few well placed nails into the carpet in the corners of a
few doorways, and that suffices.  The heads of the nails stick up about half
an inch, buried in the carpet, and that is enough.  You might try it if you
have units who only occasionally need to be reminded not to dig.  For more
avid diggers (like young ferrets seem to be), chicken wire, rectangular
mesh, or office runner stapled into the carpet near the doorway seems to
work well, as noted in the FAQ.
 
Todd Cromwell
Dors (hunter of small plastic bottles) and Seldon (hunter of dreams)
[Posted in FML issue 1776]