When I moved into my last house, the farm, we discovered all sorts of insects were already in residence and were loath to leave. Our dogs were miserable because no matter what we did for for them specifically, fleas kept returning.

A friend recommended bombing the house with XO-Trol. We used one on each floor, including the basement and attic, and also used a fan to increase the pressure in the house so that the fog would find its way into the cracks.

I swear, nothing smaller than our cat survived in that house for over a year. Ladybugs collapsed into heaps at their annual infestation, and not a single cobweb was to be found. It was the most effective critter control I've ever seen.

Of course, I will probably end up with some horrid neurological disorder as a consequence, but at least the dogs were happy.

Regards,
Rex.