What I do is get any of the games and then get a training pack with it. With the pack yo ucan change anything about the game including the breeds of dogs you get, your money, and your supplies.
Well, I heard Dalmatian & Friends is the newest and I heard a cheat to make your dog have puppies for it. I've got chihuahua & Friends and Dachshund & Friends
My opinion is Nintendogs: Dachshund and Friends or Nintendogs: Dalmatian and Friends. Dachshund and Friends has a Miniature Dachshund, Husky, Golden Retriever, and even a Beagle.