CORRECTION: This is what I wrote:
This photo was taken by Australian Frank Hurley, more widely known among Americans for his pictures of the doomed polar exploration ship the Endurance, which was ground to splinters in Antarctica in 1915. These soldiers are loading 15-lb. howitzer shells.
Steve Suddaby, immediate past-president of the WW1HA, wrote in reply:
Susan, that’s a nice picture, but those are not 15-lb shells — I think they’re 15 INCH shells. The British 15-in. howitzer shells weighted 1,400 lbs.
I’ll bet it’s a 15-lb dog, though!