Chibi-Robo! would make a great crossover with Nintendogs + Cats if you think about it. Instead of caring for your pets as usual, you can do it Chibi-Robo style making the game also feel like some sort of small adventure! Also, you should still be able to stick with the original formula if you would like too with your character being your Mii! It's just an idea I had but who agrees?