Maybe some kind of a nice big pond inside, so they can swim indoors without too much of an issue...

[Now it's Anna's turn to let out a bit of a laugh as Elsa makes her counterpoint, scratching behind her head as she does...there's no point in arguing against that; she's guilty as charged and she knows it.]

...Well, you've got me there. But he did turn out awfully cute because of it! I actually don't think I spoiled him enough!