Exactly. Pick out areas in the book where Jurgis was either directly or indirectly compared to, described as, or given the characteristics of the bull. Snippets at home, at the slaughterhouse, in his dealings with other people, his mannerisms, his speech, etc. Once you have the examples, you can make inferences about why Upton did this. Were the instances appropriate? Did they help explain the character better? What purpose did giving him animalistic tendencies serve? Perhaps a little bit more obvious, why did Upton choose a bovine animal to illuminate these personality traits?
Hope this helps!
Regards,
Gloria
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Gloria, EssayForum.com