i use advantix and revolution (for the cats)....i have no problems with fleas..2 dogs and 6 cats...but..for inside the house..when i lived in florida..where fleas can get real bad..they used .."20 mule team borax laundry powder"..sprinkle it on your carpet..etc//than vac up after a bit...but...i think you have to keep pets off carpet till you vac it up....it worked..or helped anyways...maybe someone from fla. will have heard this before?..also...dawn dish soap..diluted with water..in a spray bottle..kills them instantly....good luck..Wendy