How do I get rid of fleas on hardwood floors?

I Live in Georgia. I stay in the basement and I have all hardwood floors, with two small area rugs. I have a dog I have flea infestation. I bought some Precor, and followed those directions. I also got a flea fogger and bombed the house. I vacuumed the floors, the rugs, my bed, my couch, and washed everything in hot water, and my dry clean only items I dried on high for 30 minutes. I got rid of the bag immediately after vacuuming. I also mopped and swept after vacuuming. My dog has been properly treated and is flea free (we went to the vet yesterday). That was two weeks ago and I am seeing baby fleas now, which I was expecting because of the cycle of flea. I bombed again and sprayed the Precor and did the cleaning regimen once again. Tonight I have found 4 baby fleas within 30 minutes. What else can I do? I am at my whits end!!!