Do as ork said. As for some more advice, you will need to do some cleaning. You need to vaccume your rugs, carpet, beds, couch, chairs, pet beds, wash all the laundry and any other thing or place that can harbor fleas. You should do this for about 6-10 days to make sure your getting the adult and larval fleas. Constant vaccuming will help to keep the populations down but as long as the dog is going outside he will bring them in if hes not treated. Give the dog/s a flea bath. Also you should look into treating the areas outside where the dog goes to limit them around your pet as much as possible. They make bug treatment stuff you can put on the lawn that will help. Read all warning lables, follow all directions, and consult with the vet. Have fun cause this can be a itchy problem to deal with.