I’m not exactly sure which chapter or point in the book you are referring to. However, I believe the animals are affected by Napoleon and Squealer’s manipulation by allowing themselves to be motivated by lies. They buy into a lie that their hard work and sacrifices will ultimately improve their quality of life. Their blind faith in Napoleon is really one of the most disturbing parts of the story. They work harder, eat less, and sacrifice more in their day-to-day lives simply because they subscribe to Napoleon’s leadership and are fooled by Squealer’s manipulation. Overall, their quality of life declines under Napoleon’s leadership and their lives were better under Mr. Jones leadership.