Everyone says that the breed of your dog doesn't matter. It does to some extent. Certain breeds of dogs can get certain personalities where as others can't.
For a first puppy, get a dog that has the personality "sharp as a tack" or one along the lines of being smart. This will make your dog easier to train, even if he/she isn't the fastest in competitions.
This first dog will get you enough money to buy another dog or a cat you want.
Frenchies, Shetland Sheepdogs, and Goldies are a few smarter breeds. They'll usually be a little more expensive too.

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Nintendogs+Cats Guide
RandomHere's a guide for Nintendogs+Cats! I will have everything from the best starter breed to glitches! WARNING: There WILL be spoilers in here without a doubt.