stay at home gerbil

Scene: I'm combing Bekah's hair after a bath.

B: "I'm excited to be a mom someday. And I'm going to be a Vet."

Me: "You know, sometimes moms just stay home and don't have a job."

B: "Yeah, you stay home 'cause you don't want someone to rob us. But I'm going to get a pet (implied: to watch the house) like a dog or a gerbil."