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Special gas masks were made for dogs during the war.

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Some horses carried messages.

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More than 136,000 horses served in WWI.

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It's estimated that one million dogs died during WWI.

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It's estimated that eight million horses died in WWI.

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Special nose plugs were developed for horses so they could breath during a gas attack.

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Elephants were used to transport soldiers.

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Sergeant Stubby participated in 17 battles on the Western front.

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A dog named Sergeant Stubby

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One group of Australian soldiers adopted a rooster in Egypt.

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Many soldiers brought kangaroos as mascots.

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Dogs would sniff out explosives.

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A falcon could bring down a pigeon, but a marksman almost certainly could not.

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Pigeons flew at very fast speeds.

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At the Marne in 1914, French had 72 pigeon lofts.

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Pigeons would be found a lot on the Western front.

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The "slug brigade" saved many lives.

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Slugs would visibly indicate their discomfort by closing their breathing pores and compressing their pores, soldiers would then put on their gas masks to protect themselves.

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Slugs were used to detect mustard gas because they could before humans could.

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The essential role that horses and mules played in WWI did not go unrecognized: the U.S. Army Quartermaster Museum erected a plaque dedicated to the horses and mules that served.

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The American Red Star Relief created over 80,000 booklets to American soldiers that detailed first aid for horses.

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Used to pull pieces of artillery, supply trains, and other materials.

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Used for transportation for the soldiers and as integral members of Calvary units.

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Pigeons always flew home, so soldiers would put nests where the message needed to go to.

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100,000 carrier pigeons were used during the war.

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A message was attached to a pigeons leg and it is said that 95% of the messages were received correctly.

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Casualty Dogs- Trained to find the wounded and dying on the battlefields and were equipped with medical supplies to aid those who were suffering.

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Scout Dogs- These dogs were trained to be extremely quiet. Their role was to work with soldiers on foot patrolling the terrain ahead of them.

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Military dogs had many roles depending on their size, inelegance, and training. Their roles consisted of sentry dogs, scout dogs, casualty dogs, explosive dogs, and mascot dogs.

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- http://www.historylearningsite.co.uk/world-war-one/the-western-front-in-world-war-one/animals-in-world-war-one/dogs-in-world-war-one/
-http://www.bbc.co.uk/newsround/28604874
-http://americanhistory.si.edu/blog/how-did-animals-even-slugs-serve-world-war-i

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It is estimated that in 1918, Germany had 30,000 dogs, Britain and France and Belgian over 20,000 and Italy 3,000.