How do you put in cheats for the Nintendogs?

Unfortunately, there's no way to directly put in cheats for Nintendogs on the original DS.

Here's why:

* No Official Cheat System: Nintendogs wasn't designed to have cheat codes. There's no built-in system for entering them like some other games.

* Game Cartridge Protection: The DS cartridges are designed to prevent modifications, making it very difficult to introduce external code or cheats.

Alternatives to Cheats:

* Game Progression: You can progress in the game naturally by playing, taking care of your dog, training it, and winning competitions. This is the intended way to unlock features and rewards.

* Save File Manipulation (Not Recommended): Some people might try to use save file editors to modify the game's data. However, this is a risky practice that can potentially corrupt your save file and make your game unplayable.

Important Note: Modifying your Nintendogs save file could violate the game's terms of service and potentially damage your game cartridge.

Enjoy the Game as Intended:

The best way to experience Nintendogs is by enjoying the gameplay as it was designed. Taking care of your virtual dog, training it, and building a bond with it is a rewarding experience in itself.