Iggy (イギー Igī?) is a core ally who appears in the second half of Stardust Crusaders.

An urban mutt from the streets of New York, Iggy begrudgingly aids the protagonists on their final expedition to Cairo, Egypt to defeat DIO.

Iggy is a small black and white dog whose original appearance is modeled after that of a Boston Terrier. His paws, stomach, chest and neck are white, as are the area around his mouth and his forehead. His eyes bulge slightly, and he has loose jowls.

During and after his fight with Pet Shop, Iggy shrinks significantly, and his face becomes more cartoonishly human, with a large forehead, a small mouth and larger ears. His eyes also become much larger and more expressive.

Iggy is initially described as a particularly antisocial dog with a bad personality. His favorite treat is coffee-flavored chewing gum. He also enjoys chewing on human hair and farting in human faces. To begin with, he antagonizes Jean Pierre Polnareff most of all but is nasty to everyone around him.

Iggy values his independence, and he has a high opinion of himself, thinking himself and his Stand are stronger than Jotaro and Star Platinum.

Iggy nonetheless has some standards, notably being willing to fight with Pet Shop to save a dog-lover child. He also selflessly sacrified himself against Vanilla Ice to save Polnareff.