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The dogs that are under Napoleon's control.
Snowball
Sheep and dogs serve to advance the dictatorial ambition of Napoleon Animal Farm
Napoleon's rival that just wants to help the other farm animals. Napoleon drives him out with his dogs.
Napoleon's enforcers
Napoleon's dogs represent Stalin's security force.
The dogs obey every command made by Napoleon. They also work as his army/ body guards.
I think Dogs come from Wolves.
he used them to scare off snowball so he wouldn't come back . he also threatened with them and made them a fear tacticagainst the other animals.
Snowball was chased out of animal farm by some bllod hounds, that napoleon set onto him. Napoleon took the dogs when they were puppies and trained them to be vicious. When Napoleon brought the dogs out to attack Snowball, snowball just escaped through a hole in the hedge, and the other animals were horrified.
The animals on the animal farm allowed Napoleon to take the dogs away from the parents resulting to him teaching the dogs to do his bidding which means that the farm is under the Napoleons control when their older. Napoleon uses them and, sends them after Snowball which then result to the farm having to listen to Napoleon unless he wants one of the animals wants to die or be banished.
Napoleon convinces the the animals that all the unfortunate instances on Animal Farm were because of Snowball. He propagandized Snowball to be the bad guy and used him as a scapegoat in order to gain control. Napoleon also used the dangerous dogs to intimidate the other farm animals into not questioning him. All in all, Napoleon used power and fear the oust Snowball.