Boxer represents the loyal and uneducated proletariat, who would do everything for their leaders. They are servile and respectful and admire their current rulers from having saved them from the yoke of oppression with which their erstwhile dictatorial masters burdened them.
In the allegorical Animal Farm, Mr. Jones alludes to such dictators and since the Rebellion against him was successful and had been planned and led by the pigs, they become heroes. They easily become the leaders of the farm since they are the most intelligent. Napoleon later becomes Supreme Leader when he ousts Snowball.