I think we now have all the bases covered. If another critter was chewing on the wool, the Jacobs are now segregated from the others (two Nubian cross does, and two Shetlands) and coated to protect the wool. If they continue to lose wool under the coats we will look for another cause, but I believe we have all the bases covered at this point.
I am planning to get more coats next fall. I'm hoping to coat the Shetlands all fall and winter. They really make a mess of their wool with hay! They will be sheared a week from tomorrow (they start "rooing" or shedding their wool if I wait too long) and I will coat them (as well as the Jacobs) when I start feeding hay in the fall. Looking forward to clean fleeces next year!