The detail about the witch keeping the wolf skin at the end was inspired by the way she had a skin ready to use in
Taily-Po. I was also thinking about the witch-wolf in another Joel Chandler Harris story: "
Uncle Remus's Wonder Story" in the book Daddy Jake, The Runaway. In that story, a man marries a woman, but she's actually a witch-wolf in disguise. The man suspects nothing, but the farm animals can smell there is something wrong with her. When the woman goes to milk the cow, the cow refuses to go near her. The woman goes running off, jumping over the fence, and the man sees that she doesn't have human feet: she has wolf's feet!