The Benefits Of Diatomaceous Earth | Dogs Naturally Magazine: Diatomaceous Earth is a dirt cheap way to control external and internal parasites in your dog. Diatomaceous Earth is a non-toxic, safe substance made up from crushed fossils of freshwater organisms and marine life. Crushed to a fine powder and observed through a microscope, the particles resemble bits of broken glass. Diatomacous Earth is deadly to any insect yet completely harmless to animals.
