We have covered plenty of cool hexapod robots here in the past. They are usually designed for folks who want to study robots and learn to program them. It is always possible to turn these robots into a cat toy though. The below video shows a 6-legged walking robot acting as a cat toy:
As you can see in the above video, the robot moves and rotates to keep the attention of the cats. If you have a robot like this, you can program it to play cat sounds, capture video, and do a whole lot more. Probably not the most exiting cat toy though.