He is much more passive and is the first to suggest to rescue and not eat The Little Pilot (Atari). He frequently insists on democracy, and while he and Chief butt heads, Chief often ends being outvoted, as the other dogs agree with Rex.
His original owners owned a cushion and a heat lamp. He frequently states that he has 'had enough of this', but can find no answer for how to get off Trash Island or away from Chief.
Rex is a wiry, wire-haired mutt with a spiky, mottled, light cream coat and the light brown eyes of an Arctic sled-dog. His ribs stick out like a cast-iron radiator.
He has a big light brown nose that is in the shape of an upside down triangle. Two pointed ears. A dirty, black and white collar with a yellow stripe that runs along the middle of it, that says 'REX' on its square-shaped tag. The collar having a tiny, metal bone hanging off of it.
Rex had been deported to Trash Island after he had been tested 100% for the Dog-Flu. He found Chief, Duke, Boss, and King while on the island, causing them all to make a pack.
Rex was a house dog, Rex saying that he used to sleep on a beanbag that lied next to an electric space heater.
Rex was amazed that he looks for Spots everyday to Atari Kobayashi.
Rex's first appearance.
"Wait a second. Before we attack each other and tear ourselves to shreds like a pack of maniacs, let's just open the sack first and see what's actually in it. It might not even be worth the trouble."
"A rancid apple core, two worm-eaten banana peels, a moldy rice cake, a dried up pickle, a tin of sardine bones, a pile of broken egg shells, an old smushed-up rotten gizzard with maggots all over it—"
Rex and his friends are defeating the rival pack.
"I don't think I can stomach anymore of this garbage."
Rex saying he was once an indoor dog.
"There's no future on Trash Island."
Rex and Chief.
Rex's name tag.
Rex being motivated by his leader, Chief.
Rex and his friends.
Rex not wanting to acknowledge Chief as a stray due to him hating the concept of masters.
Rex and his friends gazing at Nutmeg.
Rex hearing from Duke that Nutmeg and Felix had mated.
Rex and his friends seeing an airplane crash on Trash Island.