Robot 'AlphaDog' joins US military
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Robotic dog unveiled by the US military

The US military has unveiled its latest piece of hardware - a robotic dog.

The AlphaDog - developed by the Defense Advanced Research Projects Agency (Darpa) - obeys commands through a touchscreen device.

It can stand upright, walk for 20 miles without a break and carry up to 400lbs.

A video produced by Darpa demonstrates the robot's skills.

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