- Jack Londonbased on "White Fang" novel by
- Gene Fowlerscreenplay and
- Sam Duncanscreenplay (as S.G. Duncan) and
- George Du Count(as George Ducount)
- Lightning(as Lightning the Wonder Dog)
Rest of cast listed alphabetically
- Russ Clark(uncredited)
- Steve Clemente(uncredited)
- Buck Connors(uncredited)
- Jack Curtis(uncredited)
- Nick De Ruiz(uncredited)
- Kendall Evans(uncredited)
- Desmond Gallagher(uncredited)
- Herbert Heywood(uncredited)
- Walter James(uncredited)
- Fred Kelsey(uncredited)
- Ethan Laidlaw(uncredited)
- Francis McDonald(uncredited)
- Bruce Mitchell(uncredited)
- Edward Peil Sr.(uncredited)
- Robert St. Angelo(uncredited)
- Jack Stoney(uncredited)
- William Wagner(uncredited)
- Blackie Whiteford(uncredited)
- Harry Woods(uncredited)
- Bogart Rogersassociate producer
- Darryl F. Zanuckexecutive producer
- Hugo Friedhofercomposer (uncredited)
- Charles Maxwellcomposer (uncredited)
- William S. Darlingart director (as William Darling)
- William Forsythassistant director (uncredited)
- Joseph E. Aikensound (uncredited)
- Roger Heman Sr.sound (uncredited)
- Jack Stoneystunts (uncredited)
- Joseph LaShellecamera operator (uncredited)
- Mary Crumleyeditorial assistant (uncredited)
- Eleanor Morraeditorial assistant (uncredited)
- Arthur Langemusical director
- Joseph M. Schenckpresenter
- Herbert Farjeondialogue director (uncredited)
- Leicester Wagnerpublicist (uncredited)
Crew believed to be complete
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