<<> I think there's reason to be at least a bit cautious when using 
> diatomaceous 
> earth.  It's quite unhealthy to breath, and would be unhealthy for the 
> lungs 
> of a pet too.
> Similarly, use caution when deciding to use another supposedly "safe and 
> natural flea killer"... Pyrethrum - an extract from chrysanthemum flowers.  
> I know of a cat who just yesterday started having seizures... the owner's 
> vet diagnosed the problem as poisoning from flea shampoo containing 
> pyrethrum, and marketed as safe for cats and dogs, NOT!>>

When we lived in Fl, nothing short of nuclear waste could not get rid of the 
critters that lived outside.  Not wanting to be invaded by these critters and 
against chemicals, I remembered a cheap, safe powder that many of my friends 
used up north in numerous applications including pets, furniture, gardens, 
etc... Diatomaceous earth.  In all the years I lived in Fl., we never had one 
flea and had a cat/dog team who used to go in and out. The DE worked wonders. 
 I would agree one should not breath it in but you can use a applicator with 
a few holes in the top(wear a mask if your worried) with low level sprinkling 
and be free of fleas, ants, etc. Once its down on the floor, sill or pet, its 
not dusty anymore, thats if you use it sparingly.  I use it now in NC for 
those pesky ants and the occasional spider. I just line the window sills, 
door jams and no more ants. I am now aware of a few people who use it for pet 
parasite control. 
I would also agree that cats are HIGHLY sensitive to chemicals whether it be 
natural or otherwise. 
Terri L.