Schneier on Security

Geese wouldn't probably be intelligent enough to undergo this kind of training, but Russians in WW2 actually used specially trained dogs to deliver bombs under enemy tanks:

The dogs selected for the special service units were strong and healthy and possessed plenty of stamina. Their training was very simple. First, they were not fed for several days, and then they began to receive food near some tanks: the meat was given to them from the tank's lower hatch. So the dog learned to go beneath the tank to be fed. The training sessions quickly became more elaborate. The dogs were unleashed in the face of tanks approaching from quite considerable distances and taught to get under the tank, not from the front but from the rear. As soon as the dog was under the tank, it stopped and the dog was fed. Before a battle the dog would not be fed. Instead, an explosive charge of between 4 and 4.6 kg with a pin detonator was attached to it. It was then sent under the enemy tanks. (V. Suvorov: Spetsnaz)