I used Frontline when I first got Smokey and after 3 months I discovered that she still had fleas :yikes: . I decided to switch to K9 Advantix and it solved a couple of problems for me. One, it got rid of all the fleas for good!!! Secondly, in Georgia, Mosquitoes are a real issue and the new park behind me condo has a large pond ( or small lake depending on how you look at it) and the Geese and the mosquitoes have decided to camp there permanently. The Advantix not only kills both the fleas and the mosquitoes put it repels them , whereas the Frontline only kills the fleas after they bite your dog. Frontline does nothing for mosquitoes, so while Smokey was on Frontline, I was constantly being followed by a formation of hungry mosquitoes when I walked Smokey.
The downside to
Advantix, as was alread mentioned is that it is toxic to cats for a couple of days after it is applied. If I owned a cat, I wouldn't use Advantix period. Now
Advantage doesn't have the mosquitoe repellant and tick protection, but it is not toxic to cats.
http://www.nofleas.com/About-Advantage.asp
This summer, my Vet, who had only stocked Frontline has added Advantix and
Advantage to his stock, mostly because of complaints that the Frontline customers had about Frontline's effectivness.