I use Revolution. I have not found any fleas on Aubrey, but I have found ticks!!! 3 in the past 3 weeks, but the good thing was is they are not imbetted(?) in his skin. The best place I have fou nd if you do order Revolution is at Dr. Foster and Smith, becasue for a 6 month supply it cost me about 60 dollars, and one dose at the vet cost me 20. THe only thing for that is you have to have a prescription. Its also good because it not just for fleas, but also for Heatworm, etc. Good luck finding one that you like!