Another new slogan in chapter 10 is "Four legs good, two legs better!" The pigs have begun to walk on two legs in this chapter, much to the surprise of the other animals. Just before this happened, Squealer took the sheep out to a distant pasture to teach them a new song (the slogan about 2 legs). When the pigs make their two-legged debut, the other animals don't know how to react. "Amazed, terrified, huddling together, the animals watched the long line of pigs march slowly round the yard. It was as though the world had turned upside-down" (p. 117). Soon after this display, Clover and Benjamin discover that the seven commandments have been reduced to one: "All animals are equal, but some animals are more equal than others" (p. 118).
The pigs' new and final slogan in chapter 10 was: "All animals are equal, but some animals are more equal than others." The final irony is that as the animals look in the windows of Jones' old house where the pigs now lived, they saw the pigs and Pilkington and a few other humans. They were all drinking and arguing. The animals watching this couldn't tell the pigs apart from the humans. The animals on Manor Farm had revolted because Jones mistreated them. He didn't take proper care of them while he lived a comfortable life. Now, the animals are in an even worse situation. They still aren't cared for, but now they are in a police state run by the pigs and life is terrible. The pigs have become the dictators and as they have become progressively more dictatorial, they have become more like the humans until there is no difference. The slogan allows for the class structure that the revolution on the farm was supposed to eliminate.