The pigs get special privileges and food, are more educated, and do less work than the other animals.
One example of inequality is that the pigs do not do any of the work in the harvest, claiming that because of their superior brainpower, they should be using their skills for supervision instead. The other animals work the harvest, and they are proud that they do it in two days less time than the humans took.
Because there is no waste and no animals steal the food, it is also the biggest harvest the farm has ever seen. Also, with the “worthless parasitical human beings gone, there was more for everyone to eat” throughout the year, even though the animals have to be more creative with some harvesting techniques since they can't use human tools and methods. The pigs are clever and the animals work hard, especially Boxer, and they figure it out.
Since the pigs are working so hard, they set aside the harness-room as their headquarters.
Here, in the evenings, they studied blacksmithing, carpentering, and other necessary arts from books which they had brought out of the farmhouse. (Ch. 3)
Snowball in particular organizes the animals into committees. They teach most of the animals to read and write, but the pigs are still the most literate. Snowball finally has to reduce the Seven Commandments of Animalism to the maxim “Four legs good, two legs bad” for the dumber animals, some of which never learn to read past the letter "A."
It is soon revealed the pigs are getting the extra milk and apples. The other animals had originally thought that these were going to be shared, but the pigs convince them that since the pigs are organizing and have to work harder than the other animals, they deserve them. Napoleon sends Squealer, his mouthpiece, to explain to the other animals.
Our sole object in taking these things is to preserve our health. Milk and apples (this has been proved by Science, comrades) contain substances absolutely necessary to the well-being of a pig. We pigs are brainworkers. (Ch. 3)
Napoleon makes sure that Squealer uses the scare tactic that Jones will come back if the pigs do not do their job, and no one questions the pigs. Napoleon has already taken the puppies by this point and is weaning them from their mother to train them as his private security force. The other animals just don’t know it yet.
By this chapter, Napoleon is already making a power play. He has not completely taken control of the farm, but everything is in place. He is using Animalism for his own gain. The other animals still believe in ideals. He is just biding his time.