The Lure of the Wild.

Jim Belmont, believing his wife Agnes loves Gordon Daniels, leaves for the Canadian wilderness with his daughter Cuddles and his dog Shep. He is killed by Mike Murdock at Daniels' instigation. Shep aids and protects Cuddles, who was abandoned to the mercy of the elements by her father's death. The dog fetches the trapper Poleon Dufresne, who sends for Agnes. She is followed by Daniels. Murdock confesses his crime to Dufresne. Shep saves Agnes from attack by Daniels and herds him to a cliff, where Daniels falls to his death. Agnes and Dufresne then wed.