Here is an illustration for the story (image source) from a 15th-century edition of Aesop's fables; this actually shows what is supposed to be a fox but I thought it might look a bit like a wolf!
M0083 = Perry022. Source: Gildersleeve 29 (shortened). This is Perry 22. Greek versions of this fable are about a fox. Phaedrus told the story about a rabbit, lepus. This lepus turned into a lupus in the medieval Latin tradition. Compare the story of the deer seeking refuge from the lion, #158.