I have two cats. They are very affectionate and particularly appreciate being tickled on the backs of their neck. I do this on regularly partly so that the flea treatment stuff doesn't come quite as much of a shock. But they seem to know as soon as I snap the top off the little vial, even if I do it in another room. And however much I stroke their necks, as soon as I replace my fingers with the flea treatment its as if I am trying to murder them. So now I have the flea treatment splashed over my tee shirt, a scratched arm and a cat who won't speak to me. I have no idea whether any of the flea treatment got to the right place.