1. Do an outside treatment around the perimeter of the house. This will stop more from coming in.
2. If you can get the pets out of the house for a few days, do it. Otherwise, treat one room at a time. There is a carpet powder you can get in the pet section at Walmart that kills fleas. Powder the carpet generously, let it sit on the carpet ALL DAY and then sweep it up.
3. One room at a time, spray anything cloth, any chair, the walls, your fabric down with flea kill spray. We used Hartz.
4. Once this is all done, give your furbaby a flea bath.
Repeat weekly until they are gone. It took us over a month to get rid of our last fleapocolypse. It sucks. They are very hardy.