This was an annual tradition, back in the day.
Via Area Photographer James Corrigan:
When you want to dress up and go fishing on a dreaded sunny day in San Francisco and you want to take along your German Shepherd, leave the two-seat BMW / Izetta Bubble Car in the garage and take the much larger VW Beetle convertible instead.
Of course. Click to enlarge:
An excellent capture from Jenner8675309, via flickr.