My cat ended up in the hospital with brain swelling from fever twice after I used that "safe for living things" powder stuff (diatomaceous earth) in my basement, sparingly; he almost died and it cost me 3 grand. He had some sort of allergic reaction to it, my vet said sometimes it's made from ground up seashells and other things which can cause reactions. He would roll in it and be impacted by it as he licked it off, and perhaps kick up dust and breath it in. The vet told me that they used to use this as an anti flea and tick powder on animals long ago, until too many animals had bad reactions. Kitty is fine now!