The Painted Hills
Adapted by True Boardman from Alexander Hull's novel "Shep of the Painted Hills" , the film stars Paul Kelly , Bruce Cowling , Ann Doran , and dog actor Pal ( credited as "Lassie" ) in a story about a collie named Shep who seeks revenge after her master is murdered . 
<triplet> Lassie <subj> Pal <obj> performer