In "Animal Farm", how do the differences between the pigs and the animals grow even greater after the defeat of Mr. Jones?

Life for the animals gets even worse. They work longer and harder, their protests drowned out by the growling dogs and bleating sheep. The pigs move into the farmhouse and begin to act more and more like humans. They even begin sleeping in beds. The pigs also start to act like Jones. Despite a shortage of food, Napoleon makes a deal to sell a stack of hay and some of the wheat crop. When the animals remember that trading with humans had been forbidden, Squeeler tells them that they are not remembering the arrangements correctly. Napoleon, acting more and more like a dictator, begins negotiations with Pilkington and Frederick, playing one against the other. It is becoming obvious that the 'classless society' of the revolution is disintegrating.