Dawn does not kill fleas, you are only drowning them. Dawn is soap, not a chemical that kills fleas. And I do recommend using a conditioner. Wildlife get bathed in Dawn because it cuts oil and it certainly isn’t used weekly. I am only trying to help you with my 30+ years experience as a...
Weekly bathing I Dawn is pretty harsh on skin, you should at least be following with conditioner. Drowning the fleas in a bath once a week does nothing to control the breeding flea population. Fleas from the environment can jump right back on your dog. A spot-on flea killer is the best way...
Use Advantage or Frontline on you dog. Treat every 3 weeks instead of 4 since you have an infestation. Mow grass short. Fleas will not be living/reproducing out in the sun. Fleas will be breeding in shady moist areas where your dog rests. Test with a product that has an insect growth...