I have two Irish setter one is the traditional setter the other is a red setter. My shock collar is on a very low setting for the red setter as anything more than 30 will make her yelp. I keep it at 20 it works she dosen't yelp but she moves her head towards it and gets the message about unacceptable behaviour so it's great with her. My other setter I've put it on the highest setting and nothing absolutely nothing it's as if nothing happened. I know it is on them properly since it works so well for one not the other. Any advice? The vibrate works but not as effective as a light aock the other one barely receives shocks anymore since after the first two times she got the idea and for her it's just the beep in rare occasions it moves to vibrate and that's all it takes she knows what comes next.