Horrie the Wog Dog was the unofficial mascot for the 2/1st Machine Gun Battalion of the Second Australian Imperial Force. An Egyptian terrier, the dog was befriended by a soldier serving in the unit when it was stationed in Egypt during the Second World War. The dog subsequently followed the battalion throughout various locations in the Middle East and in Greece and Crete, before being smuggled back to Australia in 1942. In 1945, the dog became the subject of a book by author Ion Idriess, and is believed to have been destroyed by quarantine officials, although this remains the subject of speculation with some researchers claiming that the dog survived after its owner switched it with another prior to destruction.

The 2/1st Machine Gun Battalion was a battalion of the Australian Army that was raised for service during World War II as part of the 6th Division. When it was formed on 14 December 1939, its component companies were spread across several Australian states, but it was later concentrated at Ingleburn, New South Wales, where it completed basic training in the early months of the war. In mid-1940, the battalion embarked for overseas, bound initially for the Middle East, but following the Fall of France it was diverted to the United Kingdom. Along with a larger contingent of Australians, it helped to bolster the island's garrison, undertaking defensive duties during a period when it was expected that the Germans might launch a cross-Channel invasion.