3 dogs: Vizslas & Pointers. Hunting dog. Competition dog. I used to use expensive tick products like Frontline and Advantix and, frankly, was never satisfied they actually worked that well and if I tried to pet any of the dogs anytime within a week of applying the stuff would have to wash my hands immediately. So I switched to the Happy Jack and just apply it when I know the dogs are going into tick-infested areas. I still occasionally find ticks on them, but with a much lower frequency than when using either of the brands I mentioned before. It's not perfect, but I'm definitely going to keep using it.