Final answer:
Nine fierce dogs are used by Napoleon to expel Snowball from the farm in chapter 5 of 'Animal Farm.'
Step-by-step explanation:
In chapter 5 of the book, 'Animal Farm,' Snowball is expelled from the farm by nine fierce dogs. These dogs were previously kept by Napoleon, a pig and one of the leaders of the farm. He trained them in secret and used them to carry out his orders. The dogs symbolize the use of force and intimidation for power in the novel.