Anti-tank dog
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Anti-tank dogs were dogs with explosives placed on their backs. These dogs were trained to run under enemy tanks, then the explosives were remotely detonated in order to destroy the target tank.
These dogs were trained by the Soviet Union during World War II to be used against German armored vehicles. However, these dogs were trained on Russian tanks, which used diesel fuel. Because of this, the dogs instinctively ran toward the smell of diesel fuel from the Soviet tanks instead of the intended German targets.
The German Army soon learned of the use of dogs as anti-tank weapons, so all Russian dogs were shot on sight by the Germans, who feared that the dogs might be carrying explosives. Very few dogs remained in the Eastern Front as a result of this.
After the war better anti-tank weapons became available, so it is unlikely that anti-tank dogs will ever be used again.