Proverbios 26

Like a dog going back to the food which he has not been able to keep down, is the foolish man doing his foolish acts over again.

Como perro que vuelve á su vómito, así el necio que repite su necedad.

As a dog returneth to his vomit, so a fool returneth to his folly.

As a dog that returns to his vomit, so is a fool who repeats his folly.