Nothing that a high powered rifle and a little patience won't take care of.

Kidding though, we have adopted a female cat, and whenever it is not pregnant, our yard is festooned with male cats spraying and menacing the cat, and also fighting with one another. Cats, are without a doubt a severe pain in the butt. I have a slingshot, and superballs for ammo, but I have yet to hit one, I am a terrible aim. Not that I would want to hurt it, they haven't been around lately, I think they are scared away. But I also would guess that it is not a cat doing the duty like that, they bury there doodoo. Mine does it in the mulch, and on occasion in the grass, although not much lately, because whenever I see it, it gets a cup of water thrown on it, so the mulch is fine with me, just not the grass.