The FBI tactical dog, a 2-year-old Czech German shepherd named Ape, had just completed its training a month ago and was on its second mission.

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The owner estimates that the cart could sell 50 units an hour with no trouble, a dog and soda every 2.4 minutes.

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You get what you pay for--a dog's nose has 2 billion odor receptors, 40 times as many as a human's--but there are limits to what even the military is willing to spend on an animal.

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