The Dog Sack invention first appeared in the June 1935 issue of Popular Mechanics.
It was designed to keep the car clean while giving the dog some fresh air.
According to the original article: ‘When you take your dog along for a ride, but prefer not having it inside the car, it can ride safely and comfortably in this sack, which is carried on the running board.
‘The bottom of the sack is clamped to the running board and the top is fastened to the lower part of an open window with hooks, covered with small rubber tubing to prevent marking the car.’
This invention was never added to any car models.
There was also this from December 1932: