I know the answer to the question, but I just thought of seeking outside opinion...it's discursive.
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The animals on the farm a very gulable and not very bright. The thing that they know and understand is that the pigs are very smart. So if squealer is telling them something it must be true because according to Boxer, Napoleon is always right. Also, the other animals would not question the authority of the pigs. For example, when the hens refused to give up their eggs to sell, some were sentenced to death. It is likly that the other animals did not want that to happen to them if they asked too many questions.