Shep the Sentinel (1915)

When May receives a letter from another girl telling her that Jack her lover is untrue she dismisses him Shep Jacks beautiful collie however is suspicious of Jim Hallet who some way he feels is responsible for his masters unhappiness He trails Jim and steals another letter written by Nell Borden Jims accomplice which betrays the plot This Shep brings to Jack who then is able to convince May that trickery and Jims jealousy are behind their estrangement Meanwhile Jim has schemed to enter Mays house by night and commit a robbery putting the suspicion upon Jack But Shep whom Jack has given to May hears the thief The noise of their struggle wakes May who summons Jack and the police