Flea powders come with a manual or any directions listed on the product. They'll come back because there are eggs scattered all over your house. Bomb your house with flea spray. Here read
Fleas On Dogs - What Can Be Done For Dog Fleas? | The Bug Squad
To apply powder, it is just the same as how you use it on yourself. Rub it on your pet's skin, take note skin not fur. Do not use flea collars. Dawn dish soap everyday for your pet. Oral dog flea treatment would be nice. Frontline is better than Advantage for your information :)