Another friend, the Rev. J. Cundill tells me how , while he was fishing a short time ago in Stainsby Beck, in Cleveland, a peasant came along the stream in search of a ‘wick’ ( quick or live) trout, to lay on the stomach of one of his children who was much troubled with worms, a trout so applied being a certain cure for that complaint.
Again the little sufferer may be passed under the belly of an ass or a piebald pony with good hopes of a cure in consequence. This is carried out more fully at Middlesbrough, where a friend of mine recently saw a child passed nine times over the back and under the belly of a donkey, and was informed by the parents that they hoped thus to cure it of whooping-cough.
Folklore of the Northern Counties of England