Boris O'Klein, born Arthur Boris O'Klein a French artist and cartoonist. 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."

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. O'Klein's period of greatest activity as an artist was during the 1930s, 1940s, and 1950s. During his lifetime, much of his output appears to have been purchased by tourists on trips to Paris.

O'Klein also painted with similar technique and in a more classical style ...