During the First World War, animals played a variety of essential roles on the battlefield, serving not only as working partners but also as sources of comfort for soldiers. While millions of horses, dogs, and other animals lost their lives in the conflict, their contributions ranged from practical military tasks to providing much-needed morale support.

Among the most widely recognized were dogs, which served in numerous capacities such as sentries, messengers, and medical aides. One notable example was Corporal Jackie, a dog attached to the 3rd South African Infantry, who was credited with excelling at sentry duties. Dogs carrying medical packs marked with red crosses famously brought aid to wounded troops, including at Gallipoli, despite often coming under sniper fire. Their acute hearing often allowed them to sense incoming shellfire before humans, prompting protective behavior that saved lives.

Stories of individual dogs highlight their resilience and importance. Fritz, a dog rescued after a German trawler was sunk by the British ship HMS Falmouth in 1914, survived multiple dangers during naval engagements, including the Battle of Jutland in 1916. Despite being wounded by shrapnel three times, Fritz—renamed Old Bill by British sailors—endured until his final years at Plymouth Barracks, where he was given a full naval funeral.

Horses were indispensable to the British war effort, with roughly one million deployed and nearly half perishing. Their roles spanned from transport and reconnaissance to cavalry charges. A notable horse named Warrior, ridden by Major General John Seely, demonstrated remarkable survival skills by adapting to the chaos of battle, galloping in a zig-zag pattern to avoid bullets. Warrior notably participated in the last major British cavalry charge at the Battle of Moreuil Wood in 1918. After the war, Warrior and Seely returned home to the Isle of Wight, where they shared a celebrated centenary ride in 1938 before Warrior’s death in 1941 at age 32.

Beyond the more familiar animals, less conventional creatures also played roles. Goats, pigs, and even a baboon served alongside soldiers, contributing to the diversity of animal involvement. However, not all animals were allies to human troops. The mosquito emerged as a deadly foe on the Balkan Front, where malaria claimed a significant number of soldiers at the Salonika campaign. Treatment centers in England, including one on the Isle of Sheppey, treated those afflicted, but the disease also spread locally, leading to tension over government responsibility. Rats, ever-present in the trenches, added to soldiers' hardships by disturbing rest and exacerbating stress and shell shock.

While the toll on animals was heavy in the Great War, their contributions to military operations and soldier welfare were profound, underscoring the vital if often overlooked role animals played in the conflict.