Harpo Marx plays a thief and tramp in Love Happy (). He daily steals enough food to share with an impoverished theater troupe. His brothers Chico and Groucho make hardly more than cameo appearances so it's really Harpo's film, but it does feature a famous scene between Groucho and Marilyn Monroe.
Character actress Constance Purdy (above) made an uncredited appearance as the chihuahua lady. Harpo, without speaking, nevertheless has a yapping contest with the chihuahua (below), and wins.