[The Australian Panther]

[Cpt. Butler was chairman of the Yale Record and served as aide-de-camp to Major General Charles Pelot Summerall. His illustrations were featured in several books, including "Happy Days!” (1928), Training for the Trenches: A Book of Humorous Cartoons on a Serious Subject (1917), Mademoiselle from Armentières (1930 and 1935), The Ninth Man (1936), and A Poultry Piece, Being a Discourse on the Joys of Raising Ducks and Geese (1978). The First Division Museum (Wheaton, Illinois) is part of The Cantigny First Division Foundation, a private, nonprofit organization that serves to preserve, interpret, and present the history of the 1st Infantry Division in the context of American military history and affairs. The museum hosts more than 110,000 visitors each year, and the foundation reaches another 300,000 through its publishing program, parades with its historic military vehicles, guest speakers, radio and television broadcasts, history trunks to schools, and other programs. ]
Interestingly, this one is not usually listed, so quite rare.
Happy Days - online
https://babel.hathitrust.org/cgi/pt?id=mdp.39015029550855&view=1up&seq=29

Link to the book: Training for the Trenches