J.,
You should first bathe your dog with Ivory soap or Zote (from Mexico). Zote is hard to find, usually you can find it at a Mexican Market Place like the one at Culebra in San Antonio. It is wonderful stuff. It has a Coconut Oil Base and Citronella Oil. It is good for a lot of things. If you grate it and mix with water, it kills fireant mounds. It smells good. It is mild enough to use to wash your hair and fine laundry including baby diapers. And, it works great to bathe your dogs. It leaves them smelling great and flea free.
Then, you will need to treat your yard. The best thing that works is DE (Diatomaceous Earth). It is the fine white powder/sand (tiny Diatoms from the ocean) used in Spa "Sand" filters. You can buy it from a feed store or pool supply for about $13/bag. It can either be mixed with water and sprayed, or you can sprinkle the powder, but wear a mask and make sure not to breathe it in. Don't try to spread it on a windy day. It cuts the protective covering of fleas, ticks, and other crawling bugs and they dehydrate. It is not a poison. It won't hurt your pets. Dairy farmers use it because they cannot use chemicals around their food-producing animals. You DON'T have to buy chemicals or pay high prices for professional pest control. We used this after professional pest control didn't work. You don't have to retreat in 2 weeks like you do with chemical treatments.
For permanent flea iradication, you need to get a systemic flea control pill that you give your pet once a month. However, I have known of dogs developing liver failure from one product (Advantage, I think). My Brother & Sister-in-Law's Golden Retreiver died from this. But, if I had to choose between my kids being eaten up by fleas or my Dog getting sick after 5 or 6 years, I'd still use the product.
This year, because of the drought, the fleas are very prolific. You will have to keep after it to really get rid of the problem.
Giving your Dog Garlic capsuls and Brewer's yeast is a great natural way to lessen the problem. We eat a lot of Garlic, too. It helps to keep mosquitos and fleas from biting us.
Sincerely,
BonnieW