Mary,
Try food grade diatomaceous earth. It is safe for your fuzzies (as
long as they don`t inhale a large cloud of the dust!)
Ferrets can walk through it, & lick their paws--even eat the stuff &
it is harmless. However, it is deadly to bugs. It dehydrates their
exoskeletons & they die.
We have used it for years!
Love,
Zoo
www.zoosferretsanctuary.org
[Posted in FML 6107]