Dogs are man’s best friend, through the good times and the bad. They’ve always stood by his side – even through the First World War. The U.S. War Dogs Association (USWDA) estimates 20,000 Allied dogs and 30,000 Central dogs served across the European battlefields in 1918. Another source found that more than 2,000 dogs were used on the Western Front alone. Dogs played essential roles in their military service, working so hard they barely had time for fetch.