What further examples of the differences between the pigs and the other animals occur in Chapters III and IV of Animal Farm?
The pigs quickly assert their dominance during these chapters of Animal Farm. Beginning with their decision to keep all of the milk for themselves, the pigs begin to separate themselves from the common working animals on the farm.
... the pigs were so clever that they could think of a way round every difficulty... The pigs did not actually work, but directed and supervised the others. With their superior knowledge it was natural that they should assume the leadership.
The other animals shared the labors equally, while the pigs walked behind the horses, calling out encouragement. The pigs had learned to read, and they attempted to teach the others. Napoleon took for himself the pups of Jessie and Bluebell to raise personally. The pigs decided that the apple harvest would be shared among themselves. They took control at the Battle of the Cowshed, and though Napoleon was nowhere to be seen, Snowball showed true heroic valor and tactical skills in the animals' victory.