Upon further consideration, I've updated my top 10 games list:
Nintendogs: Best Friends
Nintendogs: Shiba
Nintendogs: Dalmatian
Nintendogs: Labrador
Nintendogs: Dachshund
Nintendogs+Cats: Golden Retriever
Nintendogs+Cats: Bulldog
Nintendogs+Cats: Shiba
Nintendogs+Cats: Poodle
Nintendogs: Chihuahua