One of the YTers out in CA oftens suggests this site for alternatives to chemicals
Chinaroad Lowchens of Australia ~ Site Menu ~ Thousands of canine articles and links
and another article that has some good comments
Natural Flea Control - Nontoxic Flea and Tick Treatments for Dogs and Cats - thedailygreen.com
Just try and be careful either way you proceed. Do a YT search? Talk about it with your Vet or look up a holistic vet.
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Zack, Zeke, Zoey, Zipp RIP 6/28/12