Vacuum daily -- even 2x daily (including the furniture). Dump the vacuum contents into a plastic bag and tie it up, and remove it to the outside trash (put salt and baking soda in the bag, or if you have cedar essential oil or even indoor anti-flea spray, you can put a little in the bag before tying it up). Consider buying a steam cleaner for your furniture too.
Take a look at Wondercide.com -- they have good nontoxic products made from cedar oil. Their home spray is excellent. Their shampoo bars are also terrific. It's stuff you'll want to live with (nice smelling).
If there's carpet, I would sprinkle it with salt (or salt and baking soda) overnight --and keep the dog off of it! -- then vacuum it up.
To wash the dog, either get a bar of Wondercide's bar soap with neem oil, or a bottle of Natural Chemistry De-Flea: https://www.petco.com/shop/en/petcos...ea-pet-shampoo
. Both work well and are gentle on coats (unlike Dawn, which will kill fleas but strip the coat).
If all else fails, you may have to use a bug bomb, but I view those things as last resorts -- if you have to, try to use them on a Friday, leave for the weekend, and return Sunday night, then throw open the windows and put fans in them to draw in fresh air.
The Advantix may or may not work -- it's absolutely great in some regions and not effective in others. If it doesn't work, I would get RX flea protection from your vet -- NexGuard, Bravecto, Vectra3D, etc. The RX stuff is expensive, but it works.
You're going to be dealing with waves of fleas for a while probably, due to the life cycle. 95% of the problem is the eggs.