Military version has already been used on training exercises

Can walk and run over rugged terrain, following another robodog

The 160 pound hydraulic robot can walk, trot and even climb steps

Google has already shown off several robo-dogs, including one which has even taken part in military trials.

Now, it has unveiled a smaller, lighter version called 'spot'.

The four legged robo-pet can run, climb stairs, job next to its owner and even cope with being kicked.

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The 160 pound electrically powered and hydraulically actuated robot can walk, trot and even climb steps.

Although Boston Dynamics has not revealed what Spot will be used for, it has released a video showing off its capabilities.

The 160 pound electrically powered and hydraulically actuated robot can walk, trot and even climb steps.

A sensor on the robot’s head helps it navigate over rough terrain - and to spot when humans, or another robo-dog, is nearby by, allowing it to follow its owner and run in formation.

The robot is also shown next to its 'big brother', known as big dog.

A family affair: Spot (left) with the firm's other robot dogs

Here boy! Spot the roboDog shown wandering through Boston Dynamics office

Spot is showing roaming with another robot (right) and climbing steps.

It has already been tested in its first live military trial with Marines in Hawaii.

Officially known as the 'Legged Squad Support System', it has taken five years to develop.

It can walk and run over rugged terrain, following a soldier while carrying 400lbs of their kit and weapons.

Lance Cpl. Brandon Dieckmann, of the India Company, with Cujo the robot dog in the Kahuku Training Area, July 12, 2014, during the Rim of the Pacific 2014 exercise, where Cujo delivered water to soldiers in its biggest test yet.

CUJO THE BIG DOG Cujo is made by Boston Dynamics, which was bought by Google, and has taken and $2 million to create. It can walk and run over rugged terrain, following a soldier while carrying their kit and weapons. It can stand upright, walk for 20 miles without a break and carry up to 400lbs. The controls are simple to learn and have joysticks, and one recruit said using it 'feels like playing Call of Duty.' Advertisement It is now being thrown into the Kahuku Training Area – completely controlled and field tested by five young Marines from India Company, 3rd Battalion, 3rd Marine Regiment. The LS3 is a robotic mule, capable of traversing rugged terrain with Marines while carrying much of their load. It is programmed to follow an operator and detect large terrain objects to maneuver around. The testing for the LS3 is being observed by the Marine Corps Warfighting Lab during the Advanced Warfighting Experiment as part of Rim of the Pacific 2014, a military multilateral training event featuring 22 nations and roughly 25,000 people. Lance Cpl. Brandon Dieckmann, a Las Vegas soldier, was given the task of controlling Cujo. - and admits he remembers watching clips of the LS3 on Youtube before he joined the infantry. He said he never would have guessed he would be chosen to operate the machine, which has been affectionately nicknamed 'Cujo' by his company. Cujo is able to automatically follow a leader through rough terrain cujo can walk and run over rugged terrain, following a soldier while carrying their kit and weapons. It can walk for 20 miles without a break and carry up to 400lbs. 'The reality (is that it's) a walking robot and quadrupedal robotic legs are something that can be done (stood out to me),' Dieckmann said. 'They randomly chose us to operate it, probably because I wear glasses.' The Marines used 'Cujo' to conduct resupply missions to the various platoons around the training area. The LS3 brought water to service members in terrain difficult to reach by all-terrain vehicles. 'I was surprised how well it works,' Dieckmann said. 'I thought it was going to be stumbling around and lose its footing, but it’s actually proven to be pretty reliable and pretty rugged. It has a bit of a problem negotiating obliques and contours of hills.' The controls are simple to learn and have joysticks, and one recruit said it 'feels like playing Call of Duty.' The LS3 is being used as a logistical tool during RIMPAC as opposed to a tactical tool, due to its loud noise during movement and problems traversing certain terrains. 'I’d say 70 to 80 percent of the terrain we go through, it can go through,' Dieckmann said. 'There are times when it is going to fall over, but most of the time it can self-right and get back up on its own. Cujo is programmed to follow an operator through terrain, carrying heavy loads like water and food to Marines training.

Operators can control Cujo from a handheld device, telling him how far behind to follow.