Both the cats I had growing up were double-pawed on all four. They stayed with my parents when I left home because I lived in apartments that didn't allow pets. Sadly, they both passed within the last few years, both in their late teens.
My current two, Trouble and Sheba, were both rescues. Trouble is deaf and Sheba had a tendency to remove her hair in large quantities (her underside was bare when we got her, notice the improvement since ;-) ). They're not the best of buds, but they get along well enough. The gf has had Trouble for about 9 years, Sheba's only been in our house for a little over one.
The koi pond app on the iPad makes for excellent kittyTV. She can be transfixed by it for hours on end