This is an example of bandwagon propaganda. This is an example of bandwagon propaganda, because it'd persuade the animals to join the crowd, and be on the winning side. Since Boxer is such a popular animal, and he utters the quote "I will work harder", most, if not all of the animals would follow in his example, and they might even start adopting the slogan as their own. This would greatly benefit the pigs, if nobody tried to oppose them, and if all of the animals were with the pigs. And if none of the animals opposed them, and all animals were on their side, they would have no trouble, and their jobs would be easier then they already were.