I highly recommend "Pawbreakers" for cats affected by catnip.
http://www.edibleanimaltreats.com/
I did notice that my cats will lose interest after an hour or so, so you might want to take them away in spurts to keep them interested. Also, they are small and easily lost under furniture...
Isn't manipulation an elevated form of cleverness?
I've only seen manipulative abilities in a dog once.
My cat knew where I keep the GoodLife treats and would open the cabinet door, and knock the bag out (hopefully spilling the contents in the process). She also knew where I kept my iPod's...
