My little girl, Niko had the same digging problem.  I made a dig box for
her to no avail.  She continued to dig in her food, wasting so much of
it.  The solution: Lakewood Ferret Farm Shelter sells a food bag for
$10.00.  I am not affiliated with them at all; just a very happy
customer.  Niko never digs in her food as long as she has her food bag
holding her yummies.
 
http://www.ferretfarm.org/
Robin
 
[Posted in FML issue 4698]