Waiting for the ' off ' at a Miami beach dog derby . Dog racing on the beach at Miami , Florida , has become very popular and many visitors watch the racing daily from the promenade . Bathing girls with their entries waiting for the ' off ' at the start of a dog derby on the beach at Miami , Florida . . 25 February 1932 30s, 30's, 1930s, 1930's, thirties, nineteen thirties