Birthday Wishes

The Princess's birthday is coming up. She's asked for several things for her birthday, including (among others) a puppy. We've tried a Great Puppy Experiment already and it didn't quite turn out as we'd have liked. I have considered trying a smaller puppy, perhaps a rat terrier-type dog that would be a little better fit for the house, but I think the spouse is a little reluctant. She suggested we get the Princess a fish. This is plausible, but we'd have to find a place to put it... Maybe in the center pass-through in the kitchen...