Study up to understand the life cycle of fleas...
The Perm kills adults but not eggs...where they live the eggs hatch in a couple of days to two weeks.
Shampoo the dogs and directly spray every square inch of floor or anywhere the dog lays in or out doors every week for a month or two with a garden sprayer or more often if needed.
Whenever you see live adults you need to spray.
Two or three times will sometimes do it, then sprinkle 7 Garden dust or DE or Boraxo around the base board cracks and on the dogs once a week.
Fleas can also go dormant with the eggs living in the carpet or ground for years without hatching.
I used to use a product called Rid-A-Bug that would eliminate fleas in a house with one application of 100% floor areas if the animals were removed.
I think they changed the formula though as it used to have a room clearing smell for a couple of hours.
