Rin Tin Tin
Convinced the dog - capable of terrific stunts and possessed of a wonderfully expressive face - was exceptional, Duncan knocked on doors in Hollywood, sure that the dog could be a star. He even wrote a screenplay for him, and convinced Warner Brothers to produce it.
"He was probably the most profitable star Warner Brothers had," said Susan Orlean, author of "Rin Tin Tin: The Life and the Legend." "Every time they got into trouble, they would release a Rin Tin Tin film and bail themselves out. So they referred to him as 'the mortgage lifter.'"