We used a product called VetChem (I believe that's the spelling). It's an area spray, available at vet's. It did a great job of killing fleas in carpets and furniture. We removed the ferrets from the area; sprayed carpets, rugs, furniture, drapes, etc.; let it dry, vacuumed, and returned the ferrets. We repeated this in 10 days to get any eggs that might have hatched. It worked great. Dick B. [Posted in FML 5398]