Resetting Nintendogs: Chihuahua & Friends (NDS) – Not Possible In-Game

There is no in-game "Reset" or "New Game" option that wipes everything in Nintendogs. Save data lives on the cartridge EEPROM/Flash.

Workarounds

• "New Game" ≠ Reset: Starting a new save slot just creates a new profile; old dogs/data remain on cart. Max 3–4 slots.
• Manual Save Delete (Risky): Hold L + R + A + B + X + Y simultaneously at the Nintendo Logo / Health Warning screen (before title screen). Prompts "Delete all save data?" IRREVERSIBLE. Works on most Nintendogs versions.
• Second Cartridge: Buy a cheap used cart for a fresh start; keep original.
• DSi/3DS System Transfer: Does not transfer cartridge saves (only DSiWare/System saves).

Warning

The button combo deletes everything: dogs, money, items, unlocks, trainer info. No recovery. Back up save first if possible (requires flashcart/homebrew like Checkpoint/GodMode9 on 3DS/DSi).