Hello everyone. I am new to sheep and have a very small flock of 4 southdown ewes. They share a field with 6 larger sheep. One of the southdowns has had persistent scouring for nearly two years - throughout all seasons and grass growth phases - she is well otherwise and acts normally, but is very vulnerable to strike. The vet has frequently checked for parasites and she has had blood tests to look for any usual suspects, but all appears normal. I would be grateful for any suggestions. Could she need a supplement or should I bring her off grass altogether for a while (with a friend)? Any suggestions gratefully received.