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The working title for this film was Laddie, Son of Lassie. The picture marked the screen debut of Laddie, Lassie's first son in real life. Production charts and contemporary news items in Hollywood Reporter indicate that June Lockhart replaced Elsa Lanchester as the female lead a short time after production on the film began. Though Hollywood Reporter news items list actors James Moran, Pauline Bruce (daughter of Nigel Bruce) and Nigel Horton in the cast, their appearance in the released film has not been confirmed. Most of the picture was filmed outdoors at various locations throughout western Canada, including Patricia Bay, Christopher Point, the lake and mountain region of Banff, Lake Moraine, Lake Louise and Lake Minnewanka, and in the United States at Jackson Hole, Wyoming.
In October 1947, according to Hollywood Reporter, a plagiarism suit brought against M-G-M by a writer named John Charles Reed was heard in a federal court. Reed contended in his $200,000 lawsuit that the studio lifted the script for Son of Lassie from a story he wrote in 1943 called "Candy." The jury in the case denied Reed's charges and awarded him no damages. Unlike other films featuring "Lassie" made after Lassie Come Home, Son of Lassie was a true sequel, rather than simply a vehicle for the dog's exploits. For more information on the Lassie series, please consult the entry above for Lassie Come Home.