for those of you that don't know what this is, it is like the white lime they use to line football fields. I sell it in my business as an efficiency enhancer for industrial filters. Never heard of it used for tick prevention but having used tick powder years ago I would have to say there are some similarities in texture, but not sure if I would try it, and of course like with most of these questions, I would ask your vet
Diatomaceous earth - Wikipedia, the free encyclopedia