Fleas don't live on animals. They feed and then get off. If you vacumn the carpet on a regular basis they shouldn't be around. 99% of the time this will get rid of them. Fleas also need moisture to survive. It sounds like you keep the house very clean so the only thing I can think of is outside near the house. You can buy insecticide for the yard which will kill the majority of them.
Do you see them in the house? If you do then they must be somewhere where you're not cleaning. Change the bed linens and vacumn the furniture is my only suggestion that I can think of.
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