The Underdog is a 1943 American drama film directed by William Nigh and starring Barton MacLane, Jan Wiley and Charlotte Wynters.

[1] It is a story of how a dog overcomes his fear of fire when his young master is endangered by saboteurs.

[2] After losing his farm, a man moves to a small town in World War II.

His elder son is away serving in the army, while his younger boy struggles to fit in and clashes with a neighbourhood gang.

[3] Because of the presence of scenes showing sabotage, the War Department rejected this film from export.