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He [Snowball] was running as only a pig can run, but the dogs were close on his heels. Suddenly he slipped and it seemed certain that they had him. Then he was up again, running faster than ever, then the dogs were gaining on him again. One of them all but closed his jaws on Snowball's tail, but Snowball whisked it free just in time. Then he put on an extra spurt and, with a few inches to spare, slipped through a hole in the hedge and was seen no more. (5.14)
While violence in the text was at first only present in conflicts between animals and humans, it invades the world of Animal Farm and the interactions between the animals themselves.
To the amazement of everybody, three of them [the dogs] flung themselves upon Boxer. Boxer saw them coming and put out his great hoof, caught a dog in mid-air, and pinned him to the ground. The dog shrieked for mercy and the other two fled with their tails between their legs. Boxer looked at Napoleon to know whether he should crush the dog to death or let it go. Napoleon appeared to change countenance, and sharply ordered Boxer to let the dog go, whereat Boxer lifted his hoof, and the dog slunk away, bruised and howling. (7.24)
The sturdy, hard-working character of Boxer is able to defeat the threat of violence. Boxer, however, does not recognize his own power.
When they had finished their confession, the dogs promptly tore their throats out, and in a terrible voice Napoleon demanded whether any other animal had anything to confess. (7.25)
Violence in the text increases in severity, in accordance with Napoleon’s increasing corruption.