i have two cats and two dogs. after looking after another dog who had fleas, my four got them. i treated all of them with a treatment dropped onto their skin. but, there is still evidence of fleas after a second treatment and the odd flea in the carpets! how do i get rid of them in the house without using harmful pesticides? is there a natural remedy? i have two very small children and don’t wish to expose them to pesticides in the carpet that they play on (nor do i like them having fleas biting them!!).