Are you spreading the fur like parting a person's hair?
I can't be sure that I'm getting the drops way down into the skin on the back of my Maine Coon's head. Seemed to work last fall. I think his fur got more dense this winter. Any tricks?
If you can get the liquid to make contact with the skin you should be fine. I've never seen a cat need to be clipped in order to apply it.
I do, but his hair is just super thick!