I'd steer clear of it myself. I'd treat your dog and cats with something like Frontline, and then get Diatomaceous earth which is a natural substance, and sprinkle it on the bedding. If you get food grade, you can even sprinkle a little bit in their food (cat and dogs) to aid in worms. If they have fleas, good chance they can have worms unless you deworm them on a regular basis. What it does is dry out the outer shell of the flea. Much safer than pesticides everywhere in the environment. Do keep in mind that it is a very fine powder, and can cause breathing issues in some people, but it's what I personally would check out. Some feed stores might carry it, but found mine on Ebay.