Feat: Rat Familiar
You have a pet rat that has become magically bonded to you. You gain a familiar, and this familiar must be a rat. It still gets the benefits of familiar abilities, but its base form remains a rat.
Pathfinder 2e Database
You have a pet rat that has become magically bonded to you. You gain a familiar, and this familiar must be a rat. It still gets the benefits of familiar abilities, but its base form remains a rat.