One of the Kandorian "telepathic hounds" that serves as the loyal animal companion of Nightwing and Flamebird. Nighthound helps his masters put an end to a "metalloid" menace in Kandor in August 1964 (WF No. 143: "The Feud Between Batman and Superman!" pts. I-II--no title; "The Manhunters from Earth!").
Kandor's telepathic hounds are "strange beasts", yellow in color, with tails like wolves and snouts like wild boars, "that can locate people at any distance by reading their minds to learn where they are!" Because of their unique abilities, the creatures are employed by Kandorian authorities as telepathic bloodhounds (S No. 158: "Superman in Kandor" pts. I-III; "Invasion of the Mystery Super-Men!"; "The Dynamic Duo of Kandor!"; "The City of Super-People!").