Cassius Marcellus Coolidge’s most well-known art is the Dogs Playing Poker series. He was a true Renaissance man, and even patented a style of kitsch art. 

Research:

• Arn, Jackson. “Why This Painting of Dogs Playing Poker Has Endured for over 100 Years.” Artsy. June 6, 2018. https://www.artsy.net/article/artsy-editorial-painting-dogs-playing-poker-endured-100-years
• Barry, Dan. “Artist’s Fame Is Fleeting, But Dog Poker Is Forever.” New York Times. June 14, 2002. https://www.nytimes.com/2002/06/14/nyregion/artist-s-fame-is-fleeting-but-dog-poker-is-forever.html
• “The bicycling fraternity …” The Evening World. Oct. 17, 1892. https://www.newspapers.com/image-view/50674735/?match=1&terms=%22cassius%20coolidge%22
• Coolidge, Asenath Carver. “The Independence Day Horror at Killsbury.” Hungerford-Holbrook Company. 1905. https://books.google.com/books?id=-04LAAAAIAAJ&dq=%22cassius+coolidge%22&source=gbs_navlinks_s
• Coolidge, Cassius M. (as Kash). “The Accomodating Lender.” The Cosmopolitan. Volume 2. Schlicht & Field, 1887. P. 120. https://books.google.com/books?id=P5rNAAAAMAAJ&source=gbs_navlinks_s
• Coolidge, Cassius M. “Improvement in the processes of taking photographic pictures.” U.S. Patent Office. April 14, 1874. https://patents.google.com/patent/US149724
• “Dog Poker Art Fetches Big Bucks.” CBS News. Feb. 16, 2005. https://www.cbsnews.com/news/dog-poker-art-fetches-big-bucks/
• Edwards, Phil. “Ever stick your face in a cutout? Meet the kitsch genius who invented them.” Vox. May 29, 2015. https://www.vox.com/2015/5/29/8682601/carnival-cutouts-inventor
• “The exciting road race …” The Evening World. Sept. 26, 1892. https://www.newspapers.com/image-view/163980688/?match=1&terms=%22cassius%20coolidge%22
• “Gallinipper Mosquitos & Other Insects.” Nebraska Extension Disaster Education. https://disaster.unl.edu/gallinipper-mosquitos-other-insects/
• “George A. Banker received this week …” Pittsburg Dispatch. Aug. 16, 1892. https://www.newspapers.com/image-view/76578744/?match=1&terms=%22cassius%20coolidge%22
• Haddock, John A. “The Growth of a Century: as Illustrated in the History of Jefferson County, New York, from 1793 to 1894.” Sherman and Company, 1894. https://books.google.com/books?id=KyUVAAAAYAAJ&dq=antwerp+cassius+coolidge+bank&source=gbs_navlinks_s
• “King Gallinipper.” New York Times. April 28, 1892. https://timesmachine.nytimes.com/timesmachine/1892/04/28/104126214.pdf?pdf_redirect=true&ip=0
• Lewis, Joel. “Boat Unloading: Cassius Marcellus Coolidge,” Rutherford Red Wheelbarrow 7. Issue 7, part 2014. https://books.google.com/books?id=Zu__BgAAQBAJ&lpg=PA205&dq=coolidge%20%22september%2018%2C%201844%22&pg=PA205#v=onepage&q&f=false
• McManus, James. “Play It Close to the Muzzel and Cards on the Table.” New York Times. Dec. 3, 2005. https://www.nytimes.com/2005/12/03/sports/othersports/play-it-close-to-the-muzzle-and-paws-on-the-table.html
• Martinovic, Jelena. “Beloved By All But The Art World - The Dogs Playing Poker Painting by Cassius Marcellus Coolidge.” Artsper. Feb. 27, 2025. https://blog.artsper.com/en/a-closer-look/dogs-playing-poker-painting/
• “Mr. Cassius M. Coolidge, the New York artist and playwright …” Sun-Journal. Oct. 3, 1892. https://www.newspapers.com/image-view/828104988/?match=1&terms=%22cassius%20coolidge%22
• “A Notable Game of Poker.” The Sun. Sept. 17, 1893. https://www.loc.gov/resource/sn83030272/1893-09-17/ed-1/?sp=7&st=pdf&r=0.147%2C0.847%2C0.213%2C0.088%2C0
• “Rehearsals for ‘King Gallinipper,’ …” The Evening World. April 20, 1892. https://www.newspapers.com/image-view/50663243/?match=1&terms=%22cassius%20coolidge%22
• “Reviewed Work(s): A Prophet of Peace by Asenath Carver Coolidge and Cassius M. Coolidge.”The Advocate of Peace (1894-1920), Vol. 70, No. 5 (MAY, 1908), p. 117. https://www.jstor.org/stable/20665503
• “Teachers’ Institute.” Democrat and Chronicle. June 9, 1876. https://www.newspapers.com/image-view/135109029/?match=1&terms=%22cassius%20coolidge%22
• “The wheelmen of the Manhattan Atheltic Club …” The Evning World. Sept. 23, 1892. https://www.newspapers.com/image-view/163977579/?match=1&terms=%22cassius%20coolidge%22