How many smart-alec cats do you have in your neighborhood!! LOL
Voice of experience here: They sit on the front step, where the dogs can see them, and proceed to wash paws, ears and don't forget my long, lovely tail. Nanana! Poom goes the screen. If you listen to the hounds you would think the Huns were right outside. Don't rule out the screens on the front windows either. The cats get on the ledge. You get the picture. Good luck!!!