22 Of them the proverbs are true: “A dog returns to its vomit,”a and, “A sow that is washed returns to her wallowing in the mud.”

Read 2 Peter 2:22 Using Other Translations

But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.
What the true proverb says has happened to them: "The dog returns to its own vomit, and the sow, after washing herself, returns to wallow in the mire."
They prove the truth of this proverb: “A dog returns to its vomit.” And another says, “A washed pig returns to the mud.”