In 'Animal Farm,' what do you think is foreshadowed by the dogs' behavior toward Napoleon?
When the animals file into the barn to hear Old Major's speech, the dogs march in first, escorting the pigs in an almost military procession. Later on in the story, there is only brief mention that Bluebell's puppies have been taken away to be "educated" by Napoleon. The next glimpse of them is how they respond "beck and call" to Napoleon's summons from the house. These events all foreshadow the political purgings and executions which accompany Napoleon's rise to power, with the dogs acting as his secret (no longer really a secret!) police.
Remember, that history had already "written" Orwell's 'Animal Farm,' an allegory of the events following the fall of the czar and Stalin's establishment of yet another totalitarian state.
The dogs behavior toward Napoleon, after they have run Snowball off the farm foreshadow the extent of his power. The total nature of Napoleon's power is not evident yet at this point in the book.
Up until this point, Snowball and Napoleon have ruled the farm together, even though secretly Napoleon was plotting to get rid of Snowball. When the dogs return after Snowball runs off the property, they respond to Napoleon as their master. This behavior is an indication that all the animals will become subservient to Napoleon in a very short time.
He expresses his power in a quiet way, allowing the force of the dogs to show the rest of the animals that there is no question who the real leader is, him.