Shelly is a white female horse, but, unlike any other horse, her limbs and neck are extremely long, to the point where Chopper mistook her for a giraffe. She wears a thin brown bridle, with a dark red saddle that has light brown lining.
While visiting Long Ring Long Land, Luffy, Usopp and Tony Tony Chopper found a horse named Shelly near a house. She was waiting for her master Tonjit to come back for ten years. Once Tonjit returned, she was happy to see him. But the reunion was cut short because Foxy wounded her with his gun. This action caused Luffy to participate at the Davy Back Fight game.
As the Davy Back Fight was extended, the first member of the Foxy Pirates Luffy claimed was Shelly, in order to return her to her master.
After Luffy won the Davy Back Fight, he and the rest of the Straw Hat Pirates returned to check on Tonjit and Shelly and Shelly seems to be recovered from her wound. Then, Aokiji appeared and used his Hie Hie no Mi abilities to freeze the seas so that Tonjit and Shelly can rejoin their fellow nomads.