One reason why I was so enamoured with lions on my Kalahari safari is because they really are just really, really big cats. I live with two (much smaller) cats, so I should know.
Another animal that reminded me of my cats is the yellow mongoose. I entertained myself one evening at camp taking photos of these fellows. Yellow mongoose are about the size of a kitten, and have just about as much personality. They never stop moving. Not for a second.