Can I change or rename my pet?
This answer hasn't been translated yet, so it's shown in English.
Yes. Tap your pet's card on Home (anywhere except on your pet) to open its details, then tap Rename or Change pet; or long-press the card's name for Rename… and Change Pet…. Rename lets you type a name of up to 20 characters; clear it and save to use the animal's name instead. Change pet picks another animal or coat for the same companion: it keeps its name, hearts, hat, room, and keepsakes. Names are yours and are never translated.