Hot Dogs | S1E19
When awkward classmate Mandy asks Veronica to help her find her missing dog, a much larger scheme is exposed as they follow the trail. Meanwhile, Logan's sister Trina begs her father to play a role in her new boyfriend's movie, while Logan suspects that Trina is hiding something. This episode also has the BEST Veronica Mars monologue in the entire series (arguable, but also - not).