I don't know about the Wholistic Pet Diatomaceous Earth but I do use diatomaceous earth in the filter of my pool. it is a very very fine, almost powder like product and should not be inhaled. I have read where using it in your yard will cut down on the fleas. The way it works is that the newly hatched fleas actually get "cut" on the diatomaceous earth and die. I have not tried it for that purpose but did read up on it when I was looking for a way to control the flea problem we had. So I don't know if the product you are asking about is exactly the same product I am.
