This has been bothering me for 20 years. I even owned the DVD and watched it a lot. During the sparring scene on Caladan, Paul says that he's not in the mood for the fight. Gurney says:
"Not in the mood? Mood is a thing for [something] young pup. Mood is not for fighting"
What is that [something]? The best I've got is "Cattle and Women", but that...really doesn't sound right.