The animals are bothered that the fact that they are working and putting their force day and night while the pigs aren't working is making the animals aren't equal . Especially with Clover that Napoleon is taking of advantage of her strength while she can use it for her life to stay alive . In the text it states “ This very morning we begin rebuilding the windmill and we build all through the winter rain or shine . “ This demonstrates that the animals don't have a say in this , they have to listen to the pigs which isn't fair because they are getting their rights being taken away that all the animals aren't equal . Thus , the animals are being bothered have how much effort they put into their job they still don't get the high treatment they
