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

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

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.