Instructions
Turn on the Nintendo DS game console with your "Nintendogs" game cartridge inserted.
Hold down the "X," "Y," "A," "B," "L" and "R" buttons as soon as the console screen begins to flicker. You must hold all the buttons down before the game begins to load to access your profile and saved data.
Select your gamer profile once the system screen loads. Press the "A" button and choose the "Delete" option to remove the "Nintendogs" profile.
Restart the Nintendo DS console and start a new game of "Nintendogs." Follow the onscreen prompts to create a new profile and start breeding a new dog.