I remember me and my friend walking down the street and he saw a dog by a door. "Oh, I know this one! He's trained to give you his paw, look:". True enough, my friend extended his hand and the dog gave him his paw in a "handshake". Then my friend turned to me and said "That's why I prefer cats. A cat would never do that. She'd just look at you like you were retarded." I don't know why, but I both understood and shared the sentiment: there is something about the uncompromising spirit of cats that appeals to me.