Which character in The Summer I Turned Pretty season 3 has a dog named Rosie?

Jeremiah Fisher is the character in The Summer I Turned Pretty season 3 whose first dog is named Rosie.

The detail appears during the bridal-shower trivia in episode 6, “Last Name.” Belly answers the question incorrectly because she confuses Jeremiah’s personal history with Conrad’s, revealing how strongly the brothers’ memories remain intertwined in her mind.

Rosie is not a central on-screen character or a major plot device. Instead, the dog detail works as a small piece of relationship and character trivia, showing that Belly does not remember every fact about Jeremiah as confidently as she assumes.

The scene is easy to confuse with the season’s larger wedding conflicts, including apartment hunting and the country-club plans. Rosie is specifically connected to the trivia question about Jeremiah’s first dog, not to the wedding venue or the engagement storyline.