Petunia is Luke's dog. She is a bulldog-terrier mix. She is six years old. Petunia has an Instagram that was run by Luke and Michael has been inactive since March, 2017. She had a cameo appearance on the music video for Wildflower with her owner Luke Hemmings.
- Luke often calls Petunia "Piggy."
- Petunia is normally seen on Luke's Instagram and Snapchat stories.
- She is really cute.
- Ashton has said she looks like a "baked potato."