Years ago, we had mange sweep through our local fox population, it was really distressing to see, as beautiful creatures gradually lost all their fur. So a neighbour contacted whichever assoc. has a specific interest in them.
They delivered a cage and some 'stuff' which we were told to put on jam to help cure them of mange.We were told to make a jam sandwich, put it in the cage and wait for the fox to enter the cage to eat it and at that point the door to the cage would close and trap the fox inside, whereupon the assoc. would come along and take it away.
Fine! What could possibly go wrong?! Well, first off a cat regularly kept getting trapped inside (curiosity killed...and all that) so that didn't work. So we abandoned the cage idea and just used to make doctored jam sandwiches for it.
My neighbour took over that job. Sandwiches cut into triangles with the crusts cut off
Did the jam sandwiches help? No idea!