HURRY PLEASE
Read this excerpt from chapter 10:

And finally there was a tremendous baying of dogs and a shrill crowing from the black cockerel, and out came Napoleon himself, majestically upright, casting haughty glances from side to side, and with his dogs gambolling round him. He carried a whip in his trotter. There was a deadly silence. Amazed, terrified, huddling together, the animals watched the long line of pigs march slowly round the yard. It was as though the world had turned upside-down. Then there came a moment when the first shock had worn off and when, in spite of everything-in spite of their terror of the dogs, and of the habit, developed through long years, of never complaining, never criticising, no matter what happened--they might have uttered some word of protest. But just at that moment, as though at a signal, all the sheep burst out into a tremendous bleating of-- "Four legs good, two legs BETTER! Four legs good, two legs BETTER! Four legs good, two legs BETTER!"

How are the events in this passage ironic? Be specific and use evidence from the text to support your answer.