PETARMOR Topical Flea & Tick Treatment for Cats & Kittens, 3 Month Supply, PETARMOR Topical Flea & Tick Treatment for CatsPETARMOR Topical Flea & Tick Treatment for Cats. Contains Fipronil (the same active ingredient in FRONTLINE Top Spot. PETARMOR works that same way as FRONTLINE Top Spot for Cats. Providing full-body protection to help keep your cat or kitten (over 8 weeks old) flea and tick free. Prevention is the best medicine As with most things in life prevention is much easier.