Natural flea remedy for dogs.
Try a simple solution of lemon water. Fleas are repelled by citrus, so this can work both as a flea preventive, and for making your dog smell clean and refreshing. A useful solution can be made by pouring boiled water over lemons and allowing them to steep overnight.
This solution can then be applied all over your dog's skin using a fresh spray bottle.
More natural remedies can be found here at PetMd by clicking on the link below.
http://www.petmd.com/dog/wellness/evr_multi_flea_control