“Robot dogs” -- four-legged headless machines mounted with cameras and sensors -- may one day be prowling along the Southwest border, spotting undocumented migrants or sniffing out drug ...

The photos look like a scene out of science fiction: Robot dogs patrolling the U.S.-Mexico border, climbing over harsh terrain to search for threats and contraband. But these images are real.

Photos of robot dogs patrolling the US-Mexico border look like a scene from science fiction. But these images are real. The Department of Homeland Security is testing the technology.

The photos look like a scene out of science fiction: Robot dogs patrolling the U.S.-Mexico border, climbing over harsh terrain to search for threats and contraband. But these images are real.

The photos look like a scene out of science fiction: Robot dogs patrolling the U.S.-Mexico border, climbing over harsh terrain to search for threats and contraband. But these images are real.

The photos look like a scene out of science fiction: Robot dogs patrolling the U.S.-Mexico border, climbing over harsh terrain to search for threats and contraband. But these images are real.

The photos look like a scene out of science fiction: Robot dogs patrolling the U.S.-Mexico border, climbing over harsh terrain to search for threats and contraband. But these images are real.

The photos look like a scene out of science fiction: Robot dogs patrolling the U.S.-Mexico border, climbing over harsh terrain to search for threats and contraband. But these images are real.

The photos look like a scene out of science fiction: Robot dogs patrolling the U.S.-Mexico border, climbing over harsh terrain to search for threats and contraband. But these images are real.