The seventh commandment is perhaps, ideologically, the most important commandment in Animal Farm.
7. All animals are equal.
Almost as soon as the revolution takes place, the pigs begin to assume certain rights that break this rule. Napoleon takes the milk for himself on the very day the commandments are written.
Even Snowball, a mostly noble figure in the book, accepts it as his due to eat apples, going along with the rest of the pigs in claiming the apples as an exclusive right for the pigs alone.
Also, the pigs do not work but instead supervise the labor of the other animals. Eventually, the pigs move into the house and begin to wear clothing. When the food shortage came, the pigs received larger rations than the other animals.
The pigs also made a rule that when a pig and any other animal met on the path, the other animal had to stand aside. This rule is in addition to other new rules favoring the pigs:
all pigs had "the privilege of wearing green ribbons on their tails on Sundays."
Perhaps the greatest and most purely political breach of the seventh commandment comes when the pigs actually change the rule to read:
"All animals are equal, but some are more equal than others."