Sorry, but I forgot to mention, when I first moved to my present home, I had two cats and one dog. I was sitting in my chair watching tv and noticed a flea jumping on me. This was about 10 years ago. I called my vet and purchased Advantage. I brought it home and put it on everyone around 2pm. By 7pm I actually saw dead fleas on the bathroom floor. I couldn't undstand what those black dots were on the floor (maybe about 10) I felt really bad, but on the other hand I couldn't believe it worked so quickly!!!