i would say waite till the cat actually kills or harms an animel to kill it if you do this then you can even milk it for all its worth in some states if you sell eggs and they kill a female duck you can charge them for all the eggs that hen would have laid while a replacement (they also buy to...
my cats are always hanging around my chickens it will stalk them sometimes but nothing ever comes out of it it lays in nest boxes and in middle of flock