Soldier Dog
by Sam Angus
Definitely an older read than The Great Escape (see above), both verbally and emotionally. This is the heart-wrenching story of young Stanley. He lies about his age to join the army and serve in the First World War to escape his mean father, but also to seek out his older brother Tom who is also a soldier. He trains as a dog-handler, and the dogs are used as messengers between dug out posts and the front line. Dogs are trained to run through bomb blasts and gunfire without flinching to return back to their trainer owner - even if their life depends upon it.
A real tear-jerker of a story, with one use of bad language.