Data Die
After loading Nintendogs, on the screen where the Nintendo logo is on top and copyright information on the bottom, press and hold L + R + A + B + X + Y simultaneously to delete your data from the cartridge.

Unlockables: Chihuahua, Dachshund, and Shiba
Chihuahua: Link to someone playing Chihuahua and Friends
Dachshund: Link to someone playing Dachshund and Friends
Shiba: Link to someone playing Shiba and Friends

Unlockables: More Dogs
Beagle: Collect 2000 Owner Points
Cavalier king Charles Spaniel: Collect 14000 Owner Points
Jack Russel Terrier: When you take your dog for a walk, your dog may come across an Item called the Jack Russel Book. If you visit the kennel, you can now buy the single Jack Russel Terrier
Shetland Sheepdog: Collect 17000 Owner Points
Shih-Tzu: Collect 8000 Owner Points
Toy Poodle: Collect 4000 Owner Points
Welsh Corgi: Collect 10000 Owner Points

Unlock Dalmatian (US Ver)
To unlock the dalmation breed, you must find a fireman hat during a walk. Dalmation pups will then be available for purchase.

Unlockable(US ver): Yorkie
Get 2000 Trainer Points.

Unlockable: Balloon
You can find it at the Discount Shop after gaining 300 Owner Points.

Unlockable: Jump Rope
You can find it at Discount Shop after gaining 300 Owner Points

Unlockable: Natural Bag of Dog Food
You can find it at the Pet Supply Store after gaining 10,000 Owner Points

Unlockable: Pull Rope
You can find it at the Discount Shop after gaining 300 Owner Points.

Hint: Free Gifts and Toys
While you can purchase new toys for your pup to play with, you can actually get some goodies for free if you know where to look. When you take your Nintendog on a walk, outline a path that goes by the blue "?" boxes marked on the map. Your puppy is likely to run off screen at those points and come back with a present for you!

Your puppy will also randomly run to get presents for you if you leave the game on the "Home" screen for long. If left unattended, your Nintendog will leave the apartment and stay off screen. Simply tap on the center button (the circular one) to whistle and call back your pup who should be carrying a new present.

Hint: Gift Locator
To find out if garbage or a present is approaching during one of your walks, look at the top screen. There should be the little dog symbol on the path that you drew. If that dog symbol stops and your dog is still walking, this indicates that either garbage or a present is coming up on the floor. If it is a present, tug your dog to a stop and your dog will notice it. It will pick it up and bring it over to you. It is easier to do this when your dog is running.

Easter Egg: Bulb Treat
When the light bulb appears, Use the stylus to drag the light bulb over your Nintendogs mouth. Your Nintendog will eat it. This has nothing to do with your Nintendogs hunger as it will do nothing to make it full or hurt.