Discuss the idea of dictatorship in Animal Farm.

There is much from which to draw upon for this question. 
I would suggest that chapter 5 might be a good starting
point:

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Napoleon, with the dogs following him, now
mounted on to the raised portion of the floor where Major had previously stood to
deliver his speech. He announced that from now on the Sunday-morning Meetings would come
to an end. They were unnecessary, he said, and wasted
time.

This particular quote
reflects the dictatorship element that Napoleon sought in a couple of ways.  The first
would be the mere staging.  Notice the "raised portion of the floor," indicating that
there is a definite difference between he and the other animals.  The idea of "some
animals being more equal than others" is evident, setting the stage for his
dictatorship.  Additionally, the suspension of public discourse and his referring to
such discussion as an example of "wasted time" also brings to the forefront the idea of
a political setting where one person, he, makes the decisions for all
others.

Another quote that could be useful for you to
explore the issue of a dictatorship in the narrative would be in Chapter 8, continuing
the idea of Napoleon's status being distinctive and more elevated than the other animals
on the farm:

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Napoleon himself was not seen in public as often
as once in a fortnight. When he did appear, he was attended not only by his retinue of
dogs but by a black cockerel who marched in front of him and acted as a kind of
trumpeter, letting out a loud “cock-a-doodle-doo” before Napoleon
spoke.

The idea of Napoleon
not being seen in public is another example of the dictator element, as he does not need
to be amongst the people as he is above them.  Additionally, the "retinue of dogs" that
accompany him help to consolidate his power, as they provide protection, savagely
brutally demonstrated in the forced confessions element of chapter 7. (This would be a
great chapter upon which to focus to demonstrate the real terror in Napoleon's rule.) 
However,  in both presented quotes, the dictatorship theme is developed
nicely.