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

The pronoun is "they". A pronoun is a word that takes place of the noun (ex: she, he). The noun/s in this sentece are the dogs and cats. So if you scan through the setece, you see that they is also the dogs and cats. Therefore it is your pronoun.

They is the Pronoun because it is a word used instead of the noun (dogs andd cats)