This article is from the Fleas, Ticks, and Your Pet FAQ, by tittle@zmall.com (Cindy Tittle Moore) with numerous contributions by others.
According to Steven A. Melman and Karen L. Campbell's "Flea Control"
(John R. August, ed. 1991. Consultations in feline internal medicine.
WB Saunders & Co., Philadelphia. ISBN 0-7216-2226-7: Chapter 9),
pesticides that have caused serious or fatal illness when used ON cats
at dosages effective against fleas are:
* Carbaryl (Sevin)
* Chlorpyrifos (Dursban)
* Dichlorvos (DDVP, Vapona)
* Dioxathion (Delnav, Deltic)
* Lindane
* Malathion
* Naled (DiBrom)
* Phosmet (=prolate, Kemolate)
* Permethrin
* Propxur (Sendran, Baygon)
* Pyrethrins (but microencapsulated pyrethrins have no listed
problems)
* Ronnel (=Korlan)
* Tetrachlorvinphos (=Rabon)
The following flea-cides used ON dogs are NOT approved for use ON cats
(though they're all OK'd for indoor environmental use):
* Amitraz (Mitaban)
* Bendiocarb (Ficam)
* Chlorphenvinphos (Supona)
* Chlorpyrifos (Dursban)
* Cythioate (proban)
* Diazanon (Spectracide)
* Fenoxycarb
* Fenthion (Prospot)
* Methoprene (Precor)
The following have been reported to cause serious illness or death
when used ON dogs:
* Carbaryl (Sevin)
* Chlorpyrifos (Dursban)
* Dichlorvos (DDVP, Vapona)
* Fenthion (Prospot)
* Lindane
* Malathion
* Phosmet (Prolate, Kemolate)
* Permethrin
* Pyrethrins (but not microencapsulated)
* Ronnel (Korlan)
* Tetrachlorvinphos (Rabon)
 
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