Nintendogs: Chihuahua And Friends Codes -

Reset data:
Hold + + + + + at the Nintendo logo to delete your saved data.

Beagle:
Get 16,000 owner points.

Dachshund:
Get 50,000 owner points.
Link to a Nintendo DS with Nintendogs: Dachshund And Friends. 

Dalmatian:
Find the fireman's hat during a walk.

German Shepherd:
Get 17,000 owner points. (Japan)

Golden Retriever:
Get 10,000 owner points.

Jack Russel Terrier:
Find the Jack Russel Book to unlock this breed at the kennel.

Labrador Retriever:
Get 45,000 owner points.

Miniature Schnauzer:
Get 14,000 owner points.

Pinscher:
Get 2,000 owner points. (North America)
Get 14,000 owner points. (Japan)

Pug:
Get 35,000 owner points. (North America)
Get 4,000 owner points in the Japanese version of the game. (Japan)

Schnauzer:
Get 14,000 owner points. (North America)
Get 10,000 owner points. (Japan)

Shetland Sheepdog:
Get 8,000 owner points. (Japan)

Siberian Husky:
Get 4,000 owner points.

Shiba Inu:
Collect 30,000 owner points. (North America)
Link to a Nintendo DS with Nintendogs: Shiba And Friends. (Japan)

Shih Tzu:
Get 22,000 owner points.

Toy Poodle:
Get 8,000 owner points.

Desktop room:
Get 6,000 owner points (costs $20,000).

Outer Space room:
Get 18,000 owner points (costs $100,000).

Seaside room:
Get 12,000 owner points (costs $50,000).

Urban Living room:
Get 25,000 owner points.

Ranch House room:
Get 40,000 owner points.

Balloon:
Get 300 owner points.

Jump Rope:
Get 300 owner points.

Milk and cans:
You can get carton milk and a dog food can when you get over 300 points. It appears randomly in the pet shop.

Windup Toy:
Get 10,000 owner points.

Natural Dog Food Bag:
Get 10,000 owner points.

Pull Rope:
Get 300 owner points. Note: This is obtained at the Discount Store while on a walk.

Bowser Kart:
While walking, try to get the "?" and you might find a Mario Kart. To control it, press to move forward, to move backwards, and or to turn. If the dog(s) hit it, the kart will spin around in place, then move in the direction you want it to move.