This site is one I seem to post all the time, but it really does have some great ideas.
Chinaroad Lowchens of Australia - Ticks, fleas, bees, flies, snakes and other gremlins! And how to deal with them!
Also what I have noticed is dogs who eat commercial dog food seem to attract more fleas than those who are fed real food with some yeast flakes.
My be something to look into.