As a dog returns to his vomit, so a fool returns to his folly.
All Commentaries on Proverbs 26:11 Go To Proverbs 26
George Leo Haydock
AD 1849
Dog. This is the only animal which is known to do so. St. Peter uses this comparison to deter any from renouncing the faith; as the Fathers do, to show the misery attending a relapse. Septuagint here add, "there is a confusion", taken from Ecclesiasticus iv. 25. (Calmet)