a friend of mines horse is a windsucker. he has not long turned 5 and is about a year off the track. he was a winduscker when she first got him about a year ago and has tried everything, from the sprays to the collars but he still windsucks. she is currently replacing all the wooden posts with metal, and metal railing now also, but he still finds ways to windsuck. his conditon has dropped a little as well, he gets the same amt of feed as her two other horses which are both extremely fat and he is wormed/teeth done regularly. she is desperate to stop his windsucking, does anyone have any suggestions i can pass on to her?