The creature that would be named Fido comes from the potentially imaginary land of Nowhere frequently visited by Jimmy Jupiter during the 1940s. He is part of a race of dog-like creatures called Likker Sniks that are native of the Land of Tea. Their primary diets are licorice. Fido was gifted to Jimmy Jupiter when he rescued a member of the China People from the Bull in the China Shop. Taking the creature to sea, he used Fido to rescue Captain Cookie and his crew from the cannibalistic Licorice Men.
If Fido stayed on the island to consume them or returned to the land of the Candy Men with Jimmy remains unknown.