This painting is from the "Dogs playing poker" series by Cassius Marcellus Coolidge. This piece is called "Waterloo" but was originally titled "Judge St. Bernard Wins on a Bluff". C. M. Coolidge was an American visual artist. He was commissioned in 1903 by Brown and Bigelow to advertise cigars. He created 16 paintings for the company, 9 of the 16 depict dogs playing poker. I always liked these paintings and thought they were fun.