Under California Stars (1948) on Netflix

Plot summary

Roy has just finished his latest film and leaves for his ranch where he will be broadcasting a show celebrating his tenth year in movies. When Roy and Trigger arrive at his ranch he finds Cookie has hired his relatives. Caroline, the only relative that doesn't have a strong resemblance to Cookie, is the horse trainer. Bob Tells Roy a gang of men are hunting range horses. Roy puts a stop to hunting on his land. Pop decides there's money in kidnapping Trigger and demands a $100,000 ransom. McFarland's stepson, Ted, and his dog Tramp, run away and are found hiding in Roy's barn. A trap is set to catch the kidnappers.