Rover.com, the online alternative for dog-boarding, has picked up $3.4 million in funding, reports All Things D. Rover has been compared to Airbnb, although Rover's latest round of funding looks pretty tame in comparison to the $112 million Airbnb picked up last July. But with just nine employees and what its CEO claims is a potential market of $6.5 billion annually, Rover's potential is making a lot of analysts sit up and take notice. (More Rover.com stories.)