The origins of the series can be traced by to 1997, where Shigesato Itoi, Tsunekazu Ishihara, and Shigeru Miyamoto worked together on a pet simulation tech demo for the Nintendo 64 codenamed Cabbage. This demo used the internal clock and writable cartridges on the 64DD add-on to add an unprecedented layer of depth and customizability to the pets on consoles. It also had cross-functionality with the Game Boy, though the exact mechanics have never been revealed. After several delays and the failure and discontinuation of the 64DD in 2000, the project was ultimately canceled, but elements were taken and used in a GameCube tech demo, titled Puppy Times at this point, based on the experiences of Miyamoto when his family got a pet dog. Development shifted to the DS after the team thought the project was better suited for the system.
The original idea was for every dog breed to have its own dedicated game, as if the player chose the dog from a kennel. However, developing fifteen different games simultaneously proved too complicated and time consuming, so the project was condensed into three versions: Dachshund & Friends, Shiba & Friends (titled Lab & Friends outside of Japan), and Chihuahua & Friends. It has been re-released twice since then, first as a bundled release with a special edition Nintendo DS with a new version called Nintendogs: Best Friends, and then again as Nintendogs: Dalmatian & Friends. A full sequel, Nintendogs + Cats, released as a launch title for the Nintendo 3DS. This game also came in three different versions: French Bulldog & New Friends, Shiba & New Friends (titled Golden Retriever & New Friends outside of Japan), and Toy Poodle & New Friends.
A Labrador Retriever Nintendog features in Brawl as an Assist Trophy. When summoned, the Nintendog will appear at regular size among the players, before jumping towards the screen and trying to play with the player. This will obscure a player's view of the stage.
The Nintendogs universe saw a marginal boost in representation in Smash 4, with a new stage, two new songs, and an update to the Assist Trophy.
Stage (for Nintendo 3DS only)
These are all of the trophies from the Nintendogs series.
The following characters from the series are spirits.