Quote:
Beware of "Natural" Flea Powders
There are "all natural" flea powders sold at many pet and health food stores and in catalogs. These
powders mainly contain pennyroyal (very poisonous), peppermint, eucalyptus or other herbs.
Do not assume that these are safe just because they are in a health food store or are herbal. Herbs
and "natural" products contain chemicals, such as the chrysanthemum derivative pyrethrin, designed
to kill insects or fungi; they can also have lethal effects on mammals. Some of these herbs may even
be safe for humans to eat, but can kill rabbits.
To be safe, stick with 5% Sevin dust and frequent flea-combing.
It has several pertinent pages, including the fact that "topical" products, like Advantage and Frontline: