Sawyer's backstory. She came to Hollywood with dreams of becoming a famous singer and dancer, and even though she was clearly talented, she never got any roles (since she's not human) and had to become a secretary for a talent agency.
Woolie: Ah, poor Sawyer. I thought she'd be the one to make it. Such a dancer, with a voice of an angel... Danny: I never would have guessed... Woolie: That's what this town does to you, my boy. It wears you down. Danny: But I thought Hollywood was always looking for new talent. Woolie: Talented people, not animals. You see, the spotlight will never be on fellows like you and me. And it's foolish to think otherwise, Danny.
Also, once you know her backstory, a lot of her dialogue is quite depressing to listen to, especially this exchange:
Woolly giving up all hope after Danny inadvertently helps Darla frame them for the studio's destruction. His dreams, along with that of all the others crushed, he tells a guilt-ridden Danny that he should go home.
The Reveal after the flood when the animals see that Danny's "little angel" was Darla the entire time, having suckered Danny into helping her frame them all for the disaster at the studio.
Sawyer: (Voice breaking)She was your little angel?
Danny: She said she wanted to help us.
Tillie: And you believed her?
Danny: Well, I...I... (Sawyer looks away in devastation)
Especially bitter later when all of the animals blame Danny for ruining their careers, with Sawyer leaving to be alone when it becomes too much to listen to.