There are two unused pieces of headgear in the files of the original Nintendogs games: a chonmage wig (a Japanese male ponytail haircut worn by samurais in the Edo period to hold their helmets in place), and an afro wig. The chonmage has an unused description found in the Japanese version of the games and had all of its assets in the international releases replaced with the data for the Rainbow Wig. The afro on the other hand was finished enough that you can use cheat codes to make a dog wear it, but it does not have any leftover text or item attributes that let it be obtained as an item. It may have been cut from the games late into development due to concerns over racial offense and replaced with the Rainbow Wig, which has a very similar appearance to the afro, but with a rainbow-colored texture instead of one resembling black hair.