The Yellow Cap is a cap in Nintendogs and its 3DS sequel. It is a white and yellow colored baseball cap, similar in fashion to the Red & Blue Cap. In the 3DS version, the cap has blue "Coletta" lettering on it.
DS: "A standard baseball cap, this timeless design is available in two different colors."
3DS: "This youthful yellow cap will add a lively splash of color to a look."