Dogs and cats filled the animal shelter and the noise they made was incredibly loud. what is the pronoun in this sentence?

the primary theme of ha jin's “a decade” would be the need to revisit one's past to determine a path for the future. “a decade” is one of the twelve brief stories of ha jin's under the red flag, which takes place during the cultural revolution of china.

two factors or characteristics of a chapter that might make it difficult to read would be words i don't understand, or if i don't fully understand what's going on in the chapter. strategies i can use to get through the difficult material would be a dictionary, and re-reading previous chapters to get a better grasp of what the author is trying to say.