Well, I just found this-
Vectra 3D: Flea and Tick Prevention Arlington Animal Clinic which indicates we might just be riding out the egg cycle. I did wash their bedding when I treated them but I suppose there could have been eggs in their fur that transferred back to the beds. I also didn't vacuum since the cleaning lady comes Thursday and honestly- it's not like we were infested. We haven't seen any fleas that weren't on the dogs and I treated them at the very first sign. I'll call the vet on Monday but based on the link I posted, it looks like we might have to ride it out a little. I hate this- I feel so bad for them. Giving them all a bath and hoping that will speed it along.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226