In this line, the animals are discussing the change in the commandments of Animalism, which they had written on the wall after the rebellion.At first, the commandment clearly stated, "No animal shall sleep in a bed," as a rule against adopting human habits. However, when the pigs start living in the farmhouse and sleeping in beds, they change the rule to say, "No animal shall sleep in a bed with sheets."The animals are confused by this change, but Squealer, the pig who spreads Napoleon's propaganda, convinces them that the change is okay and for their benefit.