I take a natural approach to flea control.. I buy food grade diatomacetous earth, dump the whole bag into a tote, then put my cats and Jada in it. It's somewhat of an irritant if it gets in the eyes or is breathed in, but is nontoxic. I love it! It works great. Not much of a preventative, but it does kill all the fleas present. It can be used to treat your yard for bugs too, but it is non-discriminatory - will kill 'good' ones as well as bad. I use it once a week or once every ten days, don't have a flea problem at all.. though I do have a very powdery dog for a day or two!