Hi! So I've had my cat Carl for probably about a year now. I adopted him off of the street because he was always hanging around my porch, and now he is a 100% indoor cat. When he was outdoors he was always very aggressive to all other cats, and got in fights quite regularly. He is exceptionally sweet and loving to my boyfriend and I now. Now that he is indoors, I would love to get him a friend, but I don't know what to expect from Carl. He's probably 3 or 4, does anyone have any thoughts on how getting a kitten would go? I would assume it would be much less threatening than a full grown cat, but would he know it was a kitten? I'm afraid of him hurting it.