How are the animals rewarded for their hard work and social order on the farm? It happened in the last chapter.
The irony of this book is that the animals were not rewarded for their devotion to the farm. The best example concerns the death of the horse, Boxer, who worked so tirelessly for the good of all the animals. He was a perfect example of the devoted party member and his reward, when he could no longer work, was not a special place in a beautiful pasture but a trip to the knackers to be come glue.
Slowly but surely, the pigs turn the farm into a completely oppressive place, eventually returning its name to Manor Farm. The animals suffered for nothing—worse than nothing, actually, since so many of them died or went hungry along the way and nothing changed.