Vet has recommended off-licence use of frontline spray (for dogs), as it is used in horses. Just done it. Will need to check her again in about 10 days time and re-apply.
I know what chorioptic mange looks like, I get it quite regularly in goats, so no need to confirm. Also very distinctly only on her front feet, nothing anywhere on her body, she is not rubbing herself, none of the others have any signs of it....
I was a bit thrown by it, as it isn't mentioned anywhere in the Agnes Winter/Judith Charnley sheep diseases book, and that has so far been exhaustive for my sheep problems....