In addition to treating your dog, I would treat your home. Borax will kill both the fleas and eggs. You can find it in the detergent section of your grocery store, it's cheap and will not harm your pets. Just sprinkle it on your floors, brush into carpeting with a broom, wait a half hour or so and vacuum it up. Borax is the ingredient that is in the formula for those companies that come out to rid your home of fleas but they charge hundreds of dollars and you can do it yourself for just pennies.
You can also use it in your laundry in case you have eggs or fleas there. Here is just one of many uses for it...
The Many Household Uses of Borax