There was nothing more terrifying in the trenches than the call of a gas attack. Soldiers succumbed to the strangling effects of chlorine, phosgene, and mustard gas for years as the stalemated armies searched for new ways to defeat each other.
But it wasn’t just human combatants who suffered — many military working animals also died from chemical weapons. Dogs have been used in warfare since ancient times, serving as sentries, messengers, attackers, and even mascots. About one million dogs were killed in action in World War I, a conflict that also saw the first large-scale use of chemical weapons. The devastating effects of these gases accelerated the development of masks, worn to counteract those agents.
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| Two Airedale terriers in training at Lt. Colonel E. H. Richardson’s camp in Surrey. 1939. |
After the first use of poison gas by German forces in April 1915, the British and American governments sent out a series of quickly designed masks to filter out the toxic gases and keep their soldiers alive. Because of the critical combat role played by dogs at the time, they also developed canine gas masks.
The Germans used some 30,000 dogs on the Western Front, and the Entente kept around 20,000. Some dogs pulled heavy machine guns on trolleys, others used their keen sense of smell and hearing for sentry and scout work. Their small size helped them slip over and between trenches to deliver messages, shuttle medical supplies, or lay down communication wires.
Here is a collection of pictures of war dogs wearing gas masks against the threat of chemical warfare:
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| A French sergeant and dog wearing gas masks, near the front line during World War I. 1915. |
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| A dog of the French Army. 1918. |
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| Member of a Prussian Reichwehr regiment during a training exercise. The 1920s. |
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| Interwar German army in training exercises. 1920s. |
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