I found 2 more interesting military animals
http://en.wikipedia.org/wiki/Unsinkable_Sam
a German ship's cat who saw service in both the Kriegsmarine and Royal Navy during the Second World War, serving on board three vessels and surviving the sinking of all three.
http://en.wikipedia.org/wiki/William_Windsor_%28goat%29
He served as a lance corporal from 2001 until 2009, except for a three-month period in 2006 when he was demoted to fusilier, after inappropriate behaviour during the Queen's Official Birthday celebrations while deployed on active duty with the battalion on Cyprus.