Britain has put up a monument in Park Lane, central London, to honor all animals used in war, including horses, dogs, dolphins, elephants, pigeons and even glow worms (used in WWI to help read maps). Now, I have a hard time when people use animals to do their dirty work, particularly when better tools exist. You may recall my rant when US soldiers used pigeons to warn them if the air was bad in Iraq. But the monument's inscription says it pretty well:

Animals In War. This monument is dedicated to all the animals that served and died alongside British and allied forces in wars and campaigns throughout time.

They had no choice.

Here's an article about it: Animal war heroes statue unveiled, BBC News, November 24, 2004.