I had a flea problem in my house and found out you have to break the cycle - here's how I did it:
I put flea powder into my vaccum and vaccumed every single day for awhile. I sprayed the yard the same day I "bombed" the house and of course all the animals have to be bathed and then combed with a flea comb. Those suckers don't drown - any that don't go all the way down the drain are stunned - not dead! Consequently you have to dispose of any remaining bodies in a sealable plastic bag.
I did medicate my animals for about a year but since then we've had no problems!
Cooking is like love, it should be entered into with abandon or not at all. Oregon native transplanted to Chicago....