Ace the Wonder Dog, RKO's Rin Tin Tin-wannabe, plays Picardy Max, a mongrel dog adopted by Dan Preston (James Ellison) when both are thrown in jail for vagrancy. Dan's legal problems are quickly done away with but his pretty boarder, Shirley Haddon (Helen Wood), is increasingly troubled by Dan's obsessive competitiveness with fellow dog owner Robert Mabrey (Robert Kent). In fact, the young man's grudge against the entire Mabrey family threatens to ruin his burgeoning relationship with Shirley but everything works out fine when Picardy helps locate a kidnapped Marian Mabrey (June Clayworth). Almost a Gentleman was the second of three programmers starring Ace the Wonder Dog and produced by RKO 1938-1940. Ace also worked for Republic Pictures and was featured in the 1943 serial The Phantom.