These beautiful 1940's - 1950's vintage swap trading cards feature a dog picture on one side, and they are blank on the back. As a fan of both ephemera and vintage dog items, I really enjoyed scanning, researching, and listing these cards.
This especially nice card features a Gladys Emerson Cook illustration of a blonde cocker spaniel and a tabby cat in front of a door marked "Quiet Please":
A cute little Wirehair Fox Terrier rides a scooter:
This mischievous little Cocker Spaniel puppy, searching through a purse, reminds me of a Gustaf Tenggren Little Golden Book illustration:
A cute little Cocker Spaniel dog wears a cowboy hat and rides a rocking horse, while brandishing a lariat: