Explain whether or not the stories of animal abuse on Frederick farm are true.

I don't think it is true, it is merely Napoleon's propaganda. It suits Napoleon to denounce Pilkington because he is no longer selling him timber. Napoleon calls a meeting to announce that he has sold the timber to Frederick, not Pilkington. He denounces Foxwood and makes the pigeons change their slogan to “Death to Pilkington.” Napoleon claims that Frederick had never planned to invade Animal Farm and that he was not as cruel as rumored. Moreover, Snowball has never been at Foxwood or been Frederick’s collaborator; in reality, he has been Pilkington’s longtime collaborator.