Fleas! What is the absolute best way to get rid of them?

To sell a dog because it has fleas is the dumbest thing I have ever heard! For someone to buy a flea infested dog to bring back to their place and spread them on their yard and to the rest of their pack is rediculous and if some one did that......well..... Seven dust granuels x2!!! Works real good, and you can get pills or a liquid drop that you can administer yourself from tractor supply, any feed store or you local vet. If you have pens that are not on a concrete slab, on the ground you can also spray diesel, or if you have wooden pens burn the pens and build new ones after the fleas are gone, then make sure you administer flea meds to you dogs annually or as often as the medication requires you to do so. Another trick for your yard is using a sprayer that hooks up to you water hose... Fill the sprayer full of dawn dish soap and spray your yard, the soap will harden and suffocate the fleas! I am partial to seven dust though!