Bea has had a short clip all over a couple of times, usually as a result of having patches clipped to do a procedure, her coat has come back fine, she had a patch on her side that would stick out but then she needed another scan so was clipped again and its come back straight.
I think there is just no way of knowing until it starts to grow back, if you are going to add extra oils into the diet then I would build it up slowly, the pancreas can be a funny old thing in Cockers !