Where are they most likely coming from and how do I get rid of them?

We've had fleas in our house for the last two months. Got new carpet two months ago and have treated dog with Advantage flea prevention medicine since before we got new carpet throughout. The dog is a 7 lb poodle. We have done the candle in sudsy water at night which might have helped minimally, very minimally. We have used 20 Team Mule Borax sprinkled over the carpets and furniture. We have also used foggers and pest spray for fleas inside and on the ground outside where the dog "goes to do her bathroom business" and WE STILL HAVE FLEAS. What else can we try. I feel like we're fighting a no win battle. Got any ideas????