We bought Darwin 3 years ago and he has always a problem with wind sucking and becoming really irritable at meal times. We tried all different supplements and feeds and also tried separating him at feed times to try and calm him down but he still kicked his food all over the floor! We tried Simple Systems and have not looked back - Darwin's reduction in wind sucking is so noticeable and he is a lot calmer during meal times. Darwin hunts regularly and is on a mixture of Purabeet, Luciebix, Red bag nuts & Total Eclipse powder. People that know Darwin have commented on how well he is looking since he has been on Simple Systems.