Zeus & Roxanne (1997)

Marine biologist Mary Beth is irritated when Zeus, a mischievous dog, sneaks aboard her research boat and disrupts her work. But her annoyance turns to curiosity when the uninvited canine forms an unlikely bond with Roxanne, her captive dolphin. As the friendship between dog and dolphin grows, Mary Beth also finds herself drawn to Zeus’s owner, Terry, a bicycle-riding musician.