Nacho is a yellow-orange cat with dark brown (or black) stripes, a triangle-shaped nose, and a red collar with a bell-shaped tag. He usually likes to watch TV.
Dog is a blue dog with floppy ears, a large round nose, and he also wears a red tag, just like Nacho. Dog appears to have an interest in books, as he is usually seen reading one.
- Nacho is voiced by Eddie Deezen, who also voiced Mandark from Dexter's Laboratory.
- CutieJenna, a user from dA, happens to be a fan of Nacho and Dog.