From June 1914 Telephone Review:
Lassie's intelligence is equal to most humans and her moral sense is vastly superior. She doesn't know the inner workings of a phone, but she knows that the phone is carrying Margaret's voice from the place where Margaret is. She also knows where Margaret is, and knows that her DUTY is to bring Margaret home safely.
Unfortunately the Googlebooks scanner didn't like the halftone picture.
The same scanner did a better job on the cover art in the same periodical:
Labels: From rights to duties