so last year i used frontline...i was very dissapointed. i put it on the dogs before the summer months and during the summer. but they still caught fleas. it became a hastle because once they caught em it was hard to get rid of the infestation and poor gunnar was all pink n dry from being itchy. so had to bathe him with special medicated oatmeal shampoo for a while. this year i am trying advantix plus for the first time. so far it seems to wrk.today one of the people upstairs brought her dog over. and her poor dog is infested. i ddnt know until i was letting her dog n our dogs sniff eachother. n i noticed all of them scratching. n i am def a hater of fleas so i just took my dogs inside. i noticed one or 2 on them after i took em in. so far they seem fine but i think they def got bitten cuz they have been a bit itchy. its just flea medicine is one thing i hate to waste money on. i hate spending money on crap that isnt cheap but doesnt work. but so far im liking the advantix best out of anything i have tried before.