I want to know before I buy any of this product. I have never had a flea problem with my dogs before, but this year the fleas have been out of control. I use Frontline plus once a month on the dogs and I have also been treating my house and yard for fleas with seven dust and the fleas seem to be having a party on the poisons. I recently heard that Diatomaceous earth kills fleas with out harm to the earth and animals and humans. But I don’t want to buy something that does not work.