Valley, which was used as Aunt Elizabeth's estate for interior and exterior scenes. Beginning at the Arthur Ranch shoot, Grant and Hepburn often ad-libbed their dialogue and frequently delayed production by making each other laugh. The scene where Grant frantically asks Hepburn where his bone is was shot from 10 am until well after 4 pm because of the stars' laughing fits. After one month of shooting Hawks was seven days behind schedule. During the filming, Hawks would refer to four different versions of the film's script and make frequent changes to scenes and dialogue. His leisurely attitude on set and shutting down production to see a horse race contributed to the lost time. He took twelve days to shoot the Westlake jail scene instead of the scheduled five. Hawks later facetiously blamed the setbacks on his two stars' laughing fits and having to work with two animal actors. The terrier George was played by Skippy, known as Asta in The Thin Man film series and co-starring with Grant (as Mr. Smith) in The Awful Truth. The tame leopard Baby and the escaped circus leopard were both played by a trained leopard, Nissa. The big cat was supervised by its trainer, Olga Celeste, who stood by with a whip during shooting. At one point, when Hepburn spun around (causing her skirt to twirl) Nissa lunged at her and was subdued when Celeste cracked her whip. Hepburn wore heavy perfume to keep Nissa calm and was unafraid of the leopard, but Grant was terrified; most scenes of the two interacting are done in close-up with a stand-in. Hepburn played upon his fear by throwing a toy leopard through the roof of Grant's dressing room during production. There were several news reports about Hawks' difficulty filming the live leopard, and the potential danger to highly valuable actors, so some scenes required rear-screen projection, while several others were shot using traveling mattes. In a scene where Grant has Baby on a leash, it is quite obvious that the leash was hand painted on film because it proved impossible to make the two parts of the leash join in the traveling matte. Hawks and Hepburn had a confrontation one day during shooting. While Hepburn was chatting with a crew member, Hawks yelled "Quiet!" until the only person still talking was Hepburn. When Hepburn paused and realized that everyone was looking at her, she asked