My dog is terribly allergic to fleas.  Advantage works for her but i
break out in hives.  Frontline doesn't work quite as well for her--she
still scratches--but it still makes me turn red and itchy.  I can't
not pet my dog.  My termite guy told me he has a foolproof way of
eliminating fleas.  He dissolves mothballs in white vinegar and mixes
it with his dogs' shampoo once a month.  He swears by it and I am
desperate so I found some mothballs at CVS and was about to try it
until I read the POISON warnings on the package.  Does anyone have any
experience with this kind of flea treatment?  I already use nematodes
in the yard and boric acid in the house but all the dog has to do is
get bitten by one flea and she can't stop scratching.

You may want to try this if you have sensitive skin:
Natural Repellents and Dips

Use a mixture of Avon Skin-So-Soft, vinegar, and eucalyptus oil as a
bug repellent for humans and animals.

Natural flea and tick dip:

2 cups, packed, of fresh rosemary and/or peppermint
1 quart boiling water
4 quarts warm water

Pour the just boiled water over the fresh herbs and let steep,
covered, for 30 minutes. Strain and add the liquid to the 4 quarts of
warm water and then saturate the animal. Let it air dry.

Flea Spray

spray her with an herbal mixture of:

chamomile
valerian
licorice
witch hazel

Prepare an infusion using one tea bag of each herb, and when it's
cold, mix it with witch hazel.

Plants:

Densely grow fennel and basil around the pet area and place some of
the fresh herbs in and around their homes (inside their beds, on the
floor, etc.). They called it strewing many, many years ago.

http://www.stretcher.com/stories/980716c.cfm

Thank you, Nenna-Ga!  This sounds a lot safer than mothballs.  I will
try all suggestions.