Raidentech has a robot-dog on sale. For only $44.95 you get yourself a cute robot (looks like a dog - not a virtual pet), which can walk around automatically avoiding obstacles, turn its limbs, bark, and do “piss behaviors” (with no real mess though). The robot-dog will also play with you and react to your behavior via its touch and sonic sensors. And if you get tired of 50 pre-programmed functions, you can design your own with a remote controller. Best thing about it is that it doesn’t bite.