Saint Katy the Virgin

[T]ells the story of a large pig named Katy, who is said to be among the most evil of all pigs to the point that people even suspect she is possessed by the devil or a like minded demon due to the sow's cruel ways. As the story progresses, however, some local monks come by the farm where Katy had been living, and the local farmer offers Katy to them as an apparent gesture of good will. The monks quickly see, however, that Katy is evil and that the farmer did not intend for anything good to happen to them in the presence of this monstrous hog. Fortunately the clergy men are able to convert Katy to Catholicism and she resolves to abandon her wicked ways for a life of virtue. In time, despite having previously given birth and attempted murder, Katy is regarded by the monks of her monastery as a Virgin and even as a Saint, and the remainder of the story follows her adventures therein. -- from a review

"Saint Katy the Virgin" was originally published in a limited edition of only 199 copies by The Golden Eagle Press for Pascal Covici's Covici-Friede publishing firm in 1936 and was ironically offered as a Christmas gift for friends of the publisher; later the tale was included as one of the stories in The Long Valley in 1938. -- The Literary Encyclopedia