Doug, DON'T USE HARTZ ANYTHING!!! In fact, if you can buy it in a grocery store - DON'T!! Use only the products carried by a veterinarian. Again, you don't have to buy them from a vet, but choose the products the vets carry - you can buy these products cheaper from a whole-sale animal catalog, but please don't buy chemicals etc to be used on your animals in a grocery store! Working in an animal emergency clinic, I saw many, many, bad reactions to grocery-store flea products. I don't know if this was due to improper use of the product, but it's not worth risking. I think Dr. Williams will support me on this one. I spray my carpets and floors, as well as my furniture with Duratrol Premise Spray. I don't treat my animals at all. I haven't had fleas in 10 years, and I have 17 ferrets, 2 dogs, and 3 cats. I personally wouldn't dump flea powder in the bottom of the cage - I would be concerned about fumes - remember, we're talking about a 1 1/2 to 2 or 3 lb little animal about 2 inches away from this stuff. If you can keep your house free of fleas, the animals will be okay. Debbie Riccio WNYFLFA Rochester, NY [Posted in FML issue 1232]