A Dog's Best Friend (1959)

An orphan boy,Pip Wheeler, living with his foster parents, Wes and Millie Thurman and their two children, on a ranch near Calabasas, CAlifornia, finds a wounded, starving dog in the hills near the ranch. The dog finds a gun which had been used in the murder of a recluse, and the killer goes after the boy and the dog in a deserted part of the forest.