Sounds like a Hamish MacBeth mystery, doesn't it!
Unfortunately, we were visited by a fox this morning, and Blackie is now dead.
The kids were surprised by the discovery of her headless body, but don't seem too shocked. It happened around 6.30, by which time I thought all foxes would be back to bed, but obviously not.
Brownie and Whitey are staying in the opposite end of their pen, despite treats being offered. Poor things.