I wouldn't know how to get it on them. They are not pets. I TNR'd one guy last week so he got a dose while he was at the vet. The other guy will get the same if I can trap him. He has been difficult so far. That leaves Mama Kitty. She will let me pet her sometimes, but it takes a little more than that to get the Advantage on them. Right now I'm fighting the fleas with a variety of yard treatments.Sounds like they need a bit of Advantage flea killer . . . .