I've posted this before and use Dawn Dish Soap in the girls shampoo to prevent/kill fleas - READ this site for more information
http://my.homewithgod.com/mkcathy/household/animal.html
we have never seen a flea although my husband THINKS he had one on him today - I am adding Dawn to the girls shampoo and hoping for the best ....because I DO NOT like the Chemical Flea Controls - As I said - in 3 years in Houston....we've never had fleas...
I do treat my yard and the only thing I worry about is the girls going to the Dog Park near my home - I Really am hoping we aren't getting a flea problem too....I wanted to Re-Post this in case anyone else is having a flea problem