He is being fattened because he is going to be killed and be used as meat.
The main farm animals in "Charlotte's Web" are pigs, sheep, geese, and horses. The story primarily focuses on the pig named Wilbur and a spider named Charlotte who work together to save Wilbur from being slaughtered.
Templeton (the rat) helps Charlotte find words, Charlotte writes words on her web to save Wilbur, the sheep tells Wilbur and Charlotte that Wilbur is going to dye so everyone gets ready to save Wilbur, and the goose comforts Templeton to go to the fair to help Charlotte write words on her web.
wilbur the sheep the goose and the others pig
The sheep suggested that Charlotte weave words like "Terrific" and "Radiant" into her web to describe Wilbur, in order to attract more attention from visitors and save him from being slaughtered.
Templeton
He remembers that flies are pests and everyone is trying to get rid of them one way or another.
Wilbur Arable is the full name of the pig in the book Charlotte's Web.
By the breed of sheep being kept but eventually all sheep end up as meat.
The flesh of a sheep is called mutton or lamb depending on the age of the sheep when it is slaughtered, younger being lamb.
Wolves do not typically guard sheep. This is because the sheep are usually being eaten by the wolves that stalk them.
One example of foreshadowing in "Charlotte's Web" is when Charlotte first decides to save Wilbur by writing messages in her web, hinting at her eventual plan to help him avoid being slaughtered. Another example is when the old sheep mentions that the Zuckermans typically raise a pig to fatten up for the county fair, setting up the tension surrounding Wilbur's fate at the end of the story.
Sheep grow wool and it is shorn off. And no it doesn't hurt them.