What is the foreshadowing in chapter one in animal farm?

The pigs' eventual abuse of power is foreshadowed at several points in the novel. At the end of Chapter II, immediately after the establishment of the supposedly egalitarian Animal Farm, the extra milk taken from the cows disappears, and the text implies that Napoleon has drunk it himself. Similarly, the dogs' attack on Boxer during Napoleon's purges, in Chapter VII, foreshadows the pigs' eventual betrayal of the loyal cart-horse.