Nintendogs' Roots Were Planted On The Nintendo 64 With An Unreleased Game Called Cabbage
Nintendo experimented with a virtual pet game called Cabbage for the ultimately doomed Nintendo 64 disc drive, and some of its ideas came over to Nintendogs years later.
Nintendo also apparently experimented with applying dog animations to cats for the 3DS game, Nintendogs + Cats, but abandoned the idea when it realized how weird it looked for a cat to move like a dog. For more on Nintendogs, you can check out the video below from Did You Know Gaming.
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[Source: Did You Know Gaming]