The Frog and the Fox
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The Frog and the Fox is one of Aesop's Fables and is numbered 289 in the Perry Index.[1] It takes the form of a humorous anecdote told against quack doctors.

A frog leaves his native swamp and proclaims himself a wonder-working doctor. He is then asked by a sceptical fox how it is that he cannot cure his own lameness and sickly complexion. The fox's taunt echoes the Greek proverb, "Physician, heal thyself", which was current in Aesop's time (and was later quoted in the Christian scriptures). The fable was recorded in Greek by Babrius,[2] and afterwards was Latinised by Avianus.[3] When William Caxton featured the story in 1484, he added a comment advising caution against hypocrisy, again quoting the scriptural admonition.[4]
By the time the fable appeared in the collection illustrated by Francis Barlow (1687), the emphasis had shifted to asking for proof to back the frog's boasts:
- Pretences which no reall actions prop,
- Like crazy Structures, Straight to Ruin drop.[5]
Samuel Croxall's 1722 commentary on the fable is generalised to the advice that "we should not set up for rectifying enormities in others, while we labour under the same ourselves". But, while also quoting "Physician, heal thyself", Croxall put his finger on a weakness in the original story by warning against being motivated solely by prejudice against the person offering advice.[6] And in his amplified verse account, "Affectation expos'd" (1744), John Hawkesworth mentions several specious cures that seemed to back the frog's credentials. Its imposture is not unveiled until the healthy fox pretends to be ill. Only after the frog concurs in this self-diagnosis does the fox denounce it in public.[7]