The Anti-Tank Dog
It seems there is a common desire among weapons manufacturers to sacrifice domestic animals for the common good. This idea is another gem of the Second World War and runs off the theme of David and Goliath. While the blitzkrieg had found its way to the Eastern Front and Russia was fiercely battling the Germans, it was decided that something had to be done about German tanks. So, Soviet ingenuity came up with the idea to raise dogs that were able to deal with the tanks for them.
This is one of the few examples on this list that actually made it past testing and was used in battle. More or less, the Soviet Army raised dogs under tanks and trained them that beneath a tank was their home. All that was left was to take them from the tanks that were their homes, strap time bombs to them, and point them in the direction of new tanks to call their homes.
Of course, with the unpredictability of canines, something was bound to go wrong with this plan. Most dogs were scared by the fighting and tried to return to the Russian lines. Then their bombs would detonate. Only two battles were reported to have featured the bomber dogs until people realized they were uselessly killing off dogs which could be cared for and still serve the military in other ways.