I have been battleing fleas all summer!!! And they are winning. I have three dogs 1- Aulstrailian cattle dog 1 -Rottweiler and 1 - Labrador pup. I just found out yesterday that I've been wasting my money on frontline, advantage, and advantix. It seems that if you have a water supply on your premises be it a lake , stream , or pool that these products do not work as the dirrections say to apply. If your in my circumstance first you have to put up the dogs for at least 3 days so that their natural oils can build up then once you apply the med. you have to put them up for 5 days. That way their bodies can absorb the med properly. I am shareing this with you because some of you out there are probably like me and wasting your money and its hurting your dogs . Like I said earlier I have been fighting with fleas all summer and now I finally feel that its over.