SEGA Toy's commercial for robot cat.
-note: in Japanese, but still very watchable.
http://segatoys.co.jp/nearme/

Another commercial for same product, different style.
http://www.askmen.com/video/2006_may/may07_robot_cat.html

Tama the robot cat from another Japanese company Omron.
http://news.bbc.co.uk/1/hi/sci/tech/652293.stm

There are other robot cat's, but these are the most realistic and
commercially avalible so far.
They have various distinctive meow's, purrs and actions that mimmick a
real cat's.
They cost about $300., with some others costing more.

Won't be long now until the robot cat's want to go outside and roll in
the grass, or run around the house acting crazy.

I have a feeling my Big Mama would like to play with one until it was
in shreads.