Stan's homosexual dog Sparky had sex with him, which terrified Rex and made him run away. In the process, this shocked and appalled Stan and Clyde, and left Kenny, Kyle, and Cartman amused. He has since not made any further appearances.
Rex is a gray dog. He has a white snout and slightly darker gray paws.
|Minor Characters from Season One|
| Barbra Streisand | Bob Saget | Damien | Death (character) | Ms. Ellen | John Horsoff | Kathie Lee Gifford | Leonard Maltin | Patrick Duffy | Rex | Robert Smith | Sally Struthers | Scuzzlebutt | Sidney Poitier | Sparky|