well i have better luck with advantage then frontline...i think it depends on the area you are in. so it is good that u went with what the vet recommended b/c that is prob what is best for your area. one of the vet students here came from another state and frontline was all she was used to and it worked great for her dog, then she moved down here and found her dog to have a flea allergy and the frontline wasnt enough. but the good thing about advantage is you can use it for more than once a month if u are still seeing fleas