Robot dog could deliver your next package and an ad

We've covered robot dogs patrolling with police and training to handle terrain that could someday take them to the moon. We've even watched wheeled versions tackle some pretty wild ground. And whenever we show these machines, one question keeps coming up: What happens when they reach a flight of stairs? Well, Robot.com may have an answer.

Its new four-legged R-dog is built to carry packages where traditional wheeled delivery robots can get stuck. It can also show ads along the way, turning...