Nintendogs in Super Smash Bros. Brawl? Not Unlockable — Not a Fighter

You cannot unlock Nintendogs in Super Smash Bros. Brawl. They are not playable characters, Assist Trophies, Poké Ball Pokémon, or Stage Elements.

Why the Confusion?

• Nintendogs (2005, DS) is a virtual pet sim. No combat moveset.
• Brawl's Roster (35 chars): Focused on fighters with established move sets (Mario, Link, Pikachu, Snake, Sonic, etc.).
• Assist Trophies (Brawl): Nintendog (Golden Retriever) IS an Assist Trophy in Super Smash Bros. for Wii U / 3DS (Smash 4) and Ultimate. It covers the screen with paw prints, blocking view. Not in Brawl.

What IS Unlockable in Brawl

• Characters: Wolf, Toon Link, Jigglypuff, Ganondorf, Captain Falcon, Ness, Luigi, Marth, Mr. Game & Watch, Snake, Sonic (via SSE / Matches / Classic).
• Stages: 41 total. Unlock via SSE, Matches, CDs, Vault.
• Music / Trophies / Stickers / CDs: Massive collection.

Unlock Methods

1. Subspace Emissary (Story Mode): Play through; characters join.
2. VS Matches: Play X matches (e.g., 10 for Luigi, 20 for Falcon).
3. Classic / All-Star / Boss Battles: Clear on specific difficulties.
4. Challenges Panel: Complete specific tasks (hammer Golden Hammers for hard ones).

If you want a dog fighter: Isabelle (Animal Crossing) in Ultimate uses a fishing rod/slingshot. Duck Hunt Duo (NES Zapper dog) in Smash 4/Ultimate. No Nintendog fighter exists.