Trivia: James Cromwell was a long time vegetarian, but decided to become vegan after playing Hoggett in Babe.
Trivia: When James Cromwell was handed the screenplay for Babe, he thumbed through it to see how many lines he had. He saw that he didn't have that many, he decided that he would do it as a nice easy film. What he didn't realize was that he would have more screen time in this film than any of his previous films, just not that many lines.
Trivia: When the news reporter at the sheep dog trials is shown, he says he's reporting from The King-Smith Valley, a tribute to Dick King-Smith who wrote the novel on which this film is based.
Trivia: The talking pig is a combination of 48 real Yorkshire pigs plus an animatronic double. A makeup artist added toupee and eyelashes to each, and computer digitization manipulated pictures of the snout to make the pig appear to talk.
Answer: Rex means that they are both part of the sheepdog family, not that they are closely related. He thinks that when Fly told Babe about sheep-herding, she disgraced her whole species.