But Kay! There is a kitten out there who needs you! I see more positives than negatives, and a kitten would be a good playmate for Sissy, and LilGirl would adjust. Kittens can climb to stay out of cranky dog's way, too. Putting the litterbox where Sissy cannot get to it should not be too hard, and once they are introduced and comfy with each other, I see no reason why the kitten couldn't sleep on the couch with Sissy. Slow, careful introduction is key, and getting a kitten who has already been around dogs will help. Most rescue groups do try to familiarize kittens with canines when they can.