Jeremiah Fisher’s first dog was called Rosie in The Summer I Turned Pretty season 3.
The detail appears in episode 6, “Last Name,” during Belly’s bridal shower. Belly answers a trivia question about Jeremiah’s first dog incorrectly, mistakenly giving an answer associated with Conrad instead. The moment unsettles her because it exposes how much of her emotional history remains tied to the Fisher brothers.
Rosie is a small but revealing piece of character information. It is not a major plot event like the wedding cancellation or Belly’s move to Paris, yet it functions as a memory test inside the relationship drama. Belly’s mistake suggests that she is not fully certain about the life she is preparing to enter with Jeremiah.
The name is easy to confuse with other short pet names, especially because the scene is framed as a trivia question. In the episode’s synopsis, however, Jeremiah’s first dog is explicitly identified as Rosie.