Cats use to litter in my yard until I got chickens. I hardly see any cats in my yard anymore. My rooster is kind of big and very protective. The cats are afraid of him.but the lose neighbor cats turn any garden I make into a litter box, so I never set it up.
I can leave my coop door open at night and nothing will happen. However, the cats will eat baby chicks if I let them run around unattended.