Another natural remedy I've not seen before:
Lemon Tonic
"Use a lemon skin tonic - lemon is an effective skin toner and a parasite repellent because it contains d-limonene, among other substances. Thinly slice a whole lemon, including the peel. Add to a pint of near-boiling water and steep overnight. Sponge onto your pet's skin and coat and let air dry. Can be used daily."
I copied this from our holistic vet's website @
http://www.mercyvet.com/flea2.htm - great article about natural, comprehensive flea prevention including environment.
Regarding fresh garlic, unfortunately Diego's system can't handle. Last summer he developed colitis when I started adding a minced clove every 2 days. Poor boy became lethargic, didn't eat or drink even :(. This season I'll try the lemon tonic, powdered garlic and brewer's yeast but *after* meeting with the holistic vet so I don't upset his system again. Alisha Mobley praises Apple Cider Vinegar 1-2 tsp on top of food, 2 to 3 days/week and a good spritz before going on outings in high risk environments

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~ Lisa