Horses have appeared in works of art throughout history, frequently as depictions of the horse in battle. The horse appears less frequently in modern art partly because the horse is no longer significant either as a mode of transportation or as an implement of war. Most modern representations are of famous contemporary horses, artwork associated with horse racing, or artwork associated with the historic cowboy or Native American tradition of the American west. In the United Kingdom depictions of fox hunting and nostalgic rural scenes involving horses continue to be made.
Famous horse paintings include Leonardo da Vinci's study of horses, c. 1490, horses, c. 1490, Albrecht Dürer, Knight, Death and the Devil 1513, Peter Paul Rubens, Equestrian portrait of Crown Prince Władysław Vasa with the Battle of Khotyn in the background, 1624, Theodore Gericault, An Officer of the Imperial Horse Guards Charging, 1812, Edgar Degas, At the Races, 1877–1880, Albert Gleizes, 1911, La Chasse (The Hunt), Jean Metzinger, 1911-1912, La Femme au Cheval (Woman with a horse),Olaf Rude, 1918, Saint George and the dragon to name a few
Source - https://en.wikipedia.org/wiki/Horses_in_art.