Big Red is one of several Disney pictures filmed in Canada during the 1960s. Orphaned Gilles Payant goes to work for wealthy Walter Pidgeon, who raises prize dogs. Pidgeon's particular favorite among his canines is Big Red, who unfortunately resists all efforts to be trained. Young Payant manages to "reach" Big Red, to such an extent that Pidgeon is worried: if the boy and dog become too close, Red will never behave anyone else. Pidgeon orders Payant to stay away from Red until after an upcoming important dog show. The boy disobeys his boss, resulting in a near-tragedy.
by Hal Erickson synopsis