Ok so I know what has caused it.2013 hay is too rich for her,I had managed to get a bale of 2012 hay and prob solved,now I can't get anymore so am soaking the 2013 hay over night to reduce sugar etc,have spoke to the vet and he said to mix 2/3 soaked hay with 1/3 straw so will start that tomorrow,she is on a pre/probiotic just wondering of anyone else is having this problem?simple systems feeds have said its been common this year with the good summer we had and the hay having high sugar levels so I know I'm not alone,vet also said the same.so any tips,advice or just anyone in the same boat?