ALL of our animals have fleas! We've bathed the dogs with Pert Plus and treated them with Frontline. Bathed the cats [which was NO EASY feat!] with Pert Plus and sprayed the furniture and carpets. And, I've been vacuuming like a CRAZY person. But, we STILL have fleas! We know that our black lab got them from the dog behind us. And, now EVERYONE has them... and, we can't get rid of them! ANY ideas of what else we can do?