Dogs in World War I
When the United States entered World War I in 1917, the U.S. Army recruited horses and dogs to be sent to aid the conflict in Europe. Dogs helped haul equipment and delivered messages. "Flying A" actor William Russell donated one of his dogs.
"The latest animals to sign up for relief of their relatives at the front being the six-month-old Russian wolfhound belonging to William Russell of the American Film Company." – Santa Barbara Morning Press, June 18, 1918