We have 4 cats that are we use for vermin control. Only one of them has ever even considered going after the chickens or chicks. 'Miley' started stalking young pullets one day and on a whim, I picked up the lunge whip that we use for our horses. Everytime she would crouch, I would crack the whip behind her and then hide the whip so when she looked, she couldnt figure out where the noise came from. She would settle back in, look for another vantage point, crouch and BANG! She would practically do a mid air somersault. After about 6 or 8 firecracker pops behind her, she gave up. Its been a couple of years now and she never even thinks about it...lol