Squealer uses a number of techniques to manipulate the other animals with language. One of the most common is the threat, veiled or unveiled. The first time he is sent out to explain why the pigs must eat all the apples and drink all the milk, he asks the animals whether they want to see Jones return. This is his favorite threat and is used to justify many of Napoleon's depredations. At the same time, Squealer's words are often backed up by the dogs, who happen to be nearby and growl threateningly.
In the same speech, Squealer also uses scientific claims to justify the pigs' position:
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. The whole management and organisation of this farm depend on us. Day and night we are watching over your welfare. It is for YOUR sake that we drink that milk and eat those apples.
(The entire section contains 4 answers and 1030 words.)