Arthur Boris Klein hand colored etching "Sus aux curieux", ( On the Curious" from around 1960. From the artists The Dirty Dogs of Paris suite. Boris O'Klein, born Arthur 'Boris' Klein, (Moscow, September 26, 1893 – 1985, a French artist and cartoonist. O'Klein was born in Moscow, Russia. His family emigrated to the Alsace when he was a boy. After serving on behalf of the French in World War I, he moved to Paris. An anthropomorphic artist, he is known for his numerous prints and watercolors of dogs getting up to mischief. The prints are generally called "The Naughty Dogs" or "The Dirty Dogs" or "The Dirty Dogs of Paris." The two main themes of O'Klein's art are public urination; and male-female flirtation or desire. The numerous scenes by O'Klein of dogs lined up against walls or beside trees to urinate are part of what gives the prints their incendiary appeal for some viewers. In other prints, a number of male dogs will follow a female dog with an air of evident interest.