So you would like to adopt a robot as your pet? The Yume Neko Dream Cat might fit the bill. It is a robotic pet that makes sounds in response to your behavior and expresses itself by blinking its eyes and moving its ears. It has sensors in its head, stomach, cheeks, and back, so the cat knows when you are touching it.
This cute robotic cat reacts to its tail being touched. It runs for 5 hours on battery. Like what you see? You can buy one of these for under $300 at this time.