How does Napoleon get rid of Snowball and gain full control of the animals?
As he becomes more and more powerful, Napoleon increasingly begins to regard Snowball as a dangerous rival. Their disagreements culminate with a dispute over whether to build the windmill. Snowball believes it is essential to progress on the farm, Napoleon thinks it a waste of time and resources. Their very public debate ends in an election which, as it turns out, never takes place. Napoleon uses dogs, separated from their mothers at birth and trained as killers, to chase Snowball from the farm. After Snowball runs squealing from the room, Napoleon makes an ominous announcement:
He announced that from now on the Sunday-morning Meetings would come to an end. They were unnecessary, he said, and wasted time. In future all questions relating to the working of the farm would be settled by a special committee of pigs, presided over by himself. These would meet in private and afterwards communicate their decisions to the others.
This marks the moment when Napoleon installs himself as dictator of the farm. The animals are very concerned by this development, but cannot articulate their concerns out of a mixture of fear and confusion. In any case, any objections they could have raised would have been drowned out by the sheep, who bleat incessantly "Four legs good! Two legs bad!"