Boston Dynamics' robot dog SpotMini will soon be available for purchase, the company announced Friday, after improving the bot to roll over, walk by itself and even open doors.

"SpotMini is in pre-production now," Boston Dynamics founder Marc Raibert said at a TechCrunch robotics conference at University of California, Berkeley.

The company will start selling the dog-like robots in 2019, likely to businesses for use as a camera-equipped security guard. Their sales price has not yet been revealed.

The first version of SpotMini walked, rolled over and could even place objects in a dishwasher. Since then, it has been improved to jog, jump and autonomously navigate all kinds of terrain.

According to a new video explaining the robottarget="_blank"'>