Towards the end of the book, Squealer (the propagandist) trains the sheep to alter their slogan to "four legs good, two legs better", which they dutifully do.
təwˈɔːɹdz ðɪ ˈɛnd ʌvðə bˈʊk, skwˈiːlɚ ðə pɹˌɑːpɐɡˈændɪst tɹˈeɪnz ðə ʃˈiːp tʊ ˈɔltɚ ðɛɹ slˈoʊɡən tuː "fˈoːɹ lˈɛɡz ɡˈʊd, tˈuː lˈɛɡz bˈɛɾɚ", wˌɪtʃ ðeɪ dˈuːɾɪfəli dˈuː.