answer:I give the same advice each time. Get a professional exterminator. By the time you buy bombs and then rebomb in the prescribed period of time, it costs as much as the exterminator but there is no guarantee. For the dogs, I use Comfortis. In my area it works like a miracle, the fleas drop dead and fall off in 24 hours. It seems to help the skin as well. I don’t know if the effect is due to the medicine or just because the fleas are gone. I am not sure if it is available for cats. I don’t like using poison on my dogs but I don’t like them to have fleas. The Comfortis box of course says dose them once a month. I only use it when I see fleas. Which is sometimes months because once you get rid of them on the dog and in the environment the problem diminishes greatly. I would prefer to use natural but natural is not nearly as effective. One other thing, when they have had fleas, the often get tape worms afterwards because fleas are the host for tapes. Tapes are not diagnosed by a stool check unless there are segments visible in the stool. If you walk your dog you will see the segments in the stool sometimes, looks like moving grains of rice or you may see something that looks like dried up grain of rice on their backside. That means it is time to dose for tapes!