Things You'll Need
Instructions
Insert the Action Replay cartridge into your Nintendo DS until it clicks into place. It goes in the same slot you use to insert game cartridges.
Insert the Action Replay CD that came with the Action Replay cartridge into your computer. Once the CD loads, connect your Nintendo DS to your computer with a USB cable. You'll find a USB port on the back of the installed Action Replay cartridge.
Press the "Power" button on your Nintendo DS and wait for it to turn on and load.
Open the Action Replay Code Manager on your computer and click My Subscription.
Select the CodeJunkies codes that apply to your location. US and non-US players have separate sections.
Select "Nintendogs: Dalmatian and Friends" from the list of Nintendo DS games in your Action Replay Code Manager. This will pull up a list of all the available codes you can use in the game.
Drag the Dog 1 Size Modifier cheat codes to the Nintendo DS area of the screen. You can use three cheats to make your dog smaller during game play: the flea-size dog cheat code, the tiny dog cheat code and the small dog cheat code. Once you drag these codes over to your Nintendo DS, they will automatically save to your Action Replay cartridge and will be available the next time you play the game.