Comic Title: Adventures of Rex, the Wonder Dog #43
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Jan/Feb 1959
On Sale Date: November 4, 1958 Copyright Date November 4, 1958
Source: Library of Congress, Periodicals 1958

Frequency: Bi-monthly
Cover Price: $0.10
Page Count: 32
Editor: Julius Schwartz

Title: "The Smallest Dog on Earth"
Pages: 8

Feature(s):
Rex the Wonder Dog (of Earth-1)

Writer: John Broome
Penciller: Gil Kane
Inker: Bernard Sachs

Feature Character(s)

• Rex the Wonder Dog (last appearance in Adventures of Rex, the Wonder Dog #43; next appearance in Justice League of America #144)

Supporting Character(s)

• John Rayburn (a chemist; next appearance in Adventures of Rex, the Wonder Dog #44)

Synopsis:
Chemist John Rayburn conducts various experiments in his laboratory. Rex is visiting Rayburn to keep him company. One of Rayburn's experiments causes him to unexpectedly shrink to tiny size after drinking a special liquid. Rex also drinks the formula and becomes tiny.

Rex saves Rayburn from drowning in a puddle. He also protects him from an owl and a fox. Rayburn is eventually able to create an antidote to restore them both to normal.