Lulu and the Rabbit Next Door

Lulu spots her neighbor's rabbit sitting alone in a bare cage and worries the animal isn't getting the care it needs. Together with her cousin Mellie, she hatches a scheme to show the neighbor how much fun a rabbit can be, hoping to convince him to give his pet more attention. Their plan leads to a series of lively misadventures that teach the girls about friendship, responsibility, and the joy of pets. It's the fourth book in the series.