Robots with dog-like talents are nothing new, but it's not exactly practical to buy one that can do more than the basics. The new Aibo is cute, for instance, but not very athletic. A group of Stanford students might have a better solution. They've created Doggo, a four-legged bot that can dance, backflip, jump and trot without requiring exotic hardware. The mechanical canine is made of readily available supplies that achieve the intended acrobatics at minimal cost -- less than $3,000. Instead of using springs to bounce around, it uses force-sensing external motors that continuously determine the levels of force and torque needed for each movement. If the robot's ever out of position, the motors are ready to counteract.